President Joe Biden is preparing to unveil a series of executive actions aimed at addressing gun violence, delivering his first major action on gun control since taking office.

Biden on Thursday will also nominate David Chipman, a former federal agent and adviser at the gun control group Giffords, to be director of the Bureau of Alcohol, Tobacco, Firearms and Explosives, according to senior Biden administration officials.

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Biden has faced increasing pressure to act on gun control after a spate of mass shootings across the U.S. in recent weeks, but the White House has repeatedly emphasized the need for legislative action on guns. While the House passed a background-check bill last month, gun control measures face slim prospects in an evenly divided Senate, where Republicans remain near-unified against most proposals.

Biden will be joined by Attorney General Merrick Garland at the event, and most of the actions will come from the Justice Department.

Biden is expected to announce tighter regulations requiring buyers of “ghost guns” to undergo background checks. The homemade firearms — often assembled from parts and milled with a metal-cutting machine — often lack serial numbers used to trace them. It’s legal to build a gun in a home or a workshop and there is no federal requirement for a background check.

The president’s plans were previewed by a person familiar with the expected actions who was not authorized to publicly discuss them.

Senior administration officials confirmed that the Justice Department would issue a new proposed rule aimed at reining in ghost guns within 30 days, but offered no details on the content of the rule.

The Justice Department will also issue a proposed rule within 60 days tightening regulations on pistol-stabilizing braces, like the one used by the Boulder, Colorado, shooter in a massacre last month that left 10 dead. The rule would designate pistols used with stabilizing braces as short-barreled rifles, which, under the National Firearms Act, require a federal license to own and are subject to a more thorough application process and a $200 tax.

The Justice Department will also publish model red flag legislation within 60 days, which the administration says will make it easier for states to adopt their own red flag laws. Such laws allow for individuals to petition a court to allow the police to confiscate weapons from a person deemed to be a danger to themselves or others.

And it will begin to provide more data on firearms trafficking, starting with a new comprehensive report on the issue, which the Biden administration says it hasn’t done in over two decades.

The president will also announce investments in community violence intervention programs, which are aimed at reducing gun violence in urban communities, across five federal agencies.

Administration officials hinted there may be more to come from the administration on guns, calling the round of executive actions “initial steps” that were completed under Garland’s purview within the first few weeks of his tenure.

The ATF is currently run by acting Director Regina Lombardo. Gun-control advocates have emphasized the significance of the ATF director in enforcing the nation’s gun laws, and Chipman is certain to win praise from them. During his time as a senior policy adviser with Giffords, he spent considerable effort pushing for greater regulation and enforcement on ghost guns, reforms of the background check system and measures to reduce the trafficking of illegal firearms.

Prior to that, Chipman spent 25 years as an agent at the ATF, where he worked on stopping a trafficking ring that sent illegal firearms from Virginia to New York, and served on the ATF’s SWAT team. Chipman is a gun owner himself.

He also is an explosives expert and was among the team involved in investigating the Oklahoma City Bombing and the first World Trade Center bombing. He also was involved in investigating a series of church bombings in Alabama in the 1990s. He retired from the ATF in 2012.

Chipman and a White House spokesman both declined to comment.

During his campaign, Biden promised to prioritize new gun control measures as president, including enacting universal background check legislation, banning online sales of firearms and the manufacture and sale of assault weapons and high-capacity magazines. But gun-control advocates have said that while they were heartened by signs from the White House that they took the issue seriously, they’ve been disappointed by the lack of early action.

With the announcement of the new measures, however, advocates lauded Biden’s first moves to combat gun violence.

“Each of these executive actions will start to address the epidemic of gun violence that has raged throughout the pandemic, and begin to make good on President Biden’s promise to be the strongest gun safety president in history,” said John Feinblatt, president of Everytown for Gun Safety.

Feinblatt in particular praised the move to regulate ghost guns, which he said “will undoubtedly save countless lives,” and lauded Chipman as an “invaluable point person” in the fight against illegal gun trafficking. He also said the group is looking forward to continuing to work with the Biden administration on further gun control measures, but it’s unclear what next moves the White House, or lawmakers on Capitol Hill, will be able to take.

Biden himself expressed uncertainty late last month when asked if he had the political capital to pass new gun control proposals, telling reporters, “I haven’t done any counting yet.”

For years, federal officials have been sounding the alarm about an increasing black market for homemade, military-style semi-automatic rifles and handguns. Ghost guns have increasingly turned up at crime scenes and in recent years have been turning up more and more when federal agents are purchasing guns in undercover operations from gang members and other criminals.

It is hard to say how many are circulating on the streets, in part because in many cases police departments don’t even contact the federal government about the guns because they can’t be traced.

Some states, like California, have enacted laws in recent years to require serial numbers be stamped on ghost guns.

The critical component in building an untraceable gun is what is known as the lower receiver, a part typically made of metal or polymer. An unfinished receiver — sometimes referred to as an “80-percent receiver” — can be legally bought online with no serial numbers or other markings on it, no license required.

A gunman who killed his wife and four others in Northern California in 2017 had been prohibited from owning firearms, but he built his own to skirt the court order before his rampage. And in 2019, a teenager used a homemade handgun to fatally shoot two classmates and wound three others at a school in suburban Los Angeles.

Plans for Biden’s announcement Thursday were first reported by Politico.