Another lawyer on the Trump team, Jenna Ellis, tests positive for the virus.

By Maggie Haberman and Karen Zraick

Jenna Ellis, a senior legal adviser to President Trump, has tested positive for the coronavirus, according to a White House official familiar with the situation. She is the latest in a string of officials connected to Mr. Trump who have tested positive.

Ms. Ellis has appeared in recent weeks alongside Rudolph W. Giuliani and other Trump lawyers — a group Ms. Ellis has described as an “elite strike-force team” — at public hearings where she amplified the president’s false claims of widespread voter fraud.

Mr. Giuliani, the lead lawyer for the president’s efforts to overthrow the results of the election, confirmed over the weekend that he had tested positive for the virus, and a person who was aware of his condition but not authorized to speak publicly said then that he had been hospitalized at Georgetown University Medical. At age 76, Mr. Giuliani is in a high-risk category. Mr. Trump said on Monday that he had spoken to Mr. Giuliani and he was doing “very well.”

Ms. Ellis was photographed last week, on Wednesday, sitting next to Mr. Giuliani during a hearing before the Michigan House Oversight Committee. It was not immediately clear whether she had any symptoms, or what kind of test she had taken. Ms. Ellis continued to post to Twitter throughout the day on Tuesday, including sharing a statement attributed to her and Mr. Giuliani about their legal efforts. She did not respond to a message seeking comment.

Ms. Ellis has been a frequent guest on cable news, where she aggressively defended Mr. Trump as he faced investigation and impeachment. She presents herself as a constitutional law attorney, but has never appeared in federal district or circuit court, where most constitutional matters are considered, according to national databases of federal cases. She does not appear to have played a major role in any cases beyond criminal and civil work in Colorado.

Ms. Ellis’s most recent work appears to have been largely in a public-relations capacity. The Trump campaign and its supporters have so far filed about 50 election-related lawsuits. She has not signed her name or appeared in court to argue a single one.

More than 40 members of Mr. Trump’s administration, campaign and inner circle have contracted the virus since late September. In early October, Mr. Trump was hospitalized for a few days after testing positive and developing symptoms of Covid-19.