The announcement came after White House officials complained there were politically motivated delays by the Food and Drug Administration in approving a vaccine and therapeutics for the disease that has upended Trump’s reelection chances.

On the eve of the Republican National Convention, Trump put himself at the center of the FDA's announcement of the authorization at a news conference Sunday evening.

The authorization makes it easier for some patients to obtain the treatment but is not the same as full FDA approval.

The blood plasma, taken from patients who have recovered from the coronavirus and rich in antibodies, may provide benefits to those battling the disease.

But the evidence so far has not been conclusive about whether it works, when to administer it and what dose is needed.

In a letter describing the emergency authorization, the chief scientist for the FDA, Denise Hinton, said: “COVID-19 convalescent plasma should not be considered a new standard of care for the treatment of patients with COVID-19. Additional data will be forthcoming from other analyses and ongoing, well-controlled clinical trials in the coming months.”

But Trump had made clear to aides that he was eager to showcase good news in the battle against the virus, and the timing allowed him to head into his convention with momentum.

He and aides billed it as a “major" development and used the White House briefing room to make the announcement.

Trump also displayed some rare discipline in the evening news conference, sticking to his talking points, deferring to the head of the FDA, Stephen Hahn, and only taking three questions from reporters.

The White House had grown agitated with the pace of the plasma approval. The accusations of an FDA slowdown, which were presented without evidence, were just the latest assault from Trump’s team on what he refers to as the “deep state” bureaucracy. White House chief of staff Mark Meadows did not deal in specifics, but said that “we’ve looked at a number of people that are not being as diligent as they should be in terms of getting to the bottom of it.”

“This president is about cutting red tape,” Meadows said in an interview Sunday on “This Week" on ABC. “He had to make sure that they felt the heat. If they don’t see the light, they need to feel the heat because the American people are suffering.”

During Sunday’s 18-minute press conference, Trump said he thought there had been a “logjam” at the FDA over granting the emergency authorization. He alleged there are people at the FDA “that can see things being held up ... and that’s for political reasons.”

Dr. Joshua Sharfstein said the statement, and Hahn’s silence while Trump said it, “was disgraceful.”

“The FDA commissioner basically allowed the president to mischaracterize the decision and attack the integrity of FDA employees. I was horrified,” said Sharfstein, a vice dean at John Hopkins University’s school of public health who was a top FDA official during the Obama administration.

“This is a promising therapy that has not been fully established,” he said

The push on Sunday came a day after Trump tweeted sharp criticism on the process to treat the virus, which has killed more than 175,000 Americans and imperiled his reelection chances.

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