WASHINGTON — The Senate confirmed the first of President Trump’s Cabinet nominees Friday evening, his picks for two major national security posts, but the rest may have to wait days or weeks before they can officially join the new administration.

Retired Gen. James Mattis, Trump’s pick to head the Department of Defense, won confirmation on a 98-1 vote shortly after 5 p.m., hours after Trump took the oath of office at the Capitol. Retired Gen. John F. Kelly, his choice to lead the Department of Homeland Security, was subsequently confirmed 88-11.

Both former Marine Corps generals were well known to senators and earned bipartisan support as their nominations headed to the Senate floor. Mattis was previously in charge of U.S. Central Command, with responsibility for the wars in Iraq and Afghanistan, while Kelly led U.S. Southern Command. Perhaps more critically, both showed a willingness to break with new president’s controversial campaign positions during their confirmation hearings last week, on matters including the likelihood of building a wall on the border with Mexico and the importance of countering the Kremlin to preserve the hegemony of NATO.

While Democrats were ready to endorse Trump’s generals, they are withholding support from almost all of Trump’s other Cabinet nominees, threatening to slow-walk proceedings on the floor if the president-elect doesn’t force his picks to go back to the committees and answer more questions. But it is unclear whether they will be able to persuade any Republicans to join them in opposition, and Democrats cannot ultimately reject any of the nominees without Republican allies.

“If there was ever a group of Cabinet nominees that cry out for rigorous scrutiny, it’s this one,” Senate Minority Leader Charles Schumer, D-N.Y., said Thursday, calling Trump’s Cabinet “a swamp full of billionaires” beset with “conflicts and ethical issues as far as the eye can see.”

A early tiff emerged Friday over the nomination of Rep. Mike Pompeo, R-Kan., selected to serve as CIA director. Several Democratic senators raised objections to proceeding with Pompeo’s confirmation without an extended floor debate, even though they could not block an up-or-down vote.

“This is about whether the Senate is going to be a rubber stamp and whether the senate is in effect going to abdicate its responsibilities to do oversight,” said Sen. Ron Wyden, D-Ore., a senior member of the Senate Select Committee on Intelligence.

Schumer asked the Trump transition Thursday to keep CIA Director John Brennan in office until a final vote Monday – much as President Obama kept former CIA Director Michael V. Hayden for three weeks after his own inauguration. The request was not granted: Brennan, who has sharply criticized Trump’s recent comments on the U.S. intelligence community, left Friday upon Trump’s inauguration.

In a sign that Pompeo will ultimately be confirmed, the Senate advanced his nomination Friday on an 89-8 procedural vote.

Other nominees could wait much longer than Pompeo: Democrats are prepared to delay at least eight other nominees until they are able to register their complaints, either in another round of committee questions or on the floor.

Those nominees include attorney general nominee Jeff Sessions, who faces deep skepticism over his civil rights views and record; Education nominee Betsy DeVos, who underwent aggressive questioning from Democrats on Tuesday over her views on education policy and showed a tenuous grasp of some key issues; Health and Human Services nominee Tom Price, a Georgia congressman who is accused of using his legislative post to help companies he had invested in; and Mick Mulvaney, Trump’s pick for the Office of Management and Budget, who admitted failing to pay taxes for a domestic employee for four years.

Another nominee who has inspired controversy is State Department nominee Rex Tillerson, the former chief executive of oil giant Exxon Mobil. The Senate Foreign Relations Committee is expected to vote on his nomination Monday, but it is not clear that Tillerson will win the support of a majority of members. Democrats are all but uniformly opposed to his nomination, and Florida Republican Sen. Marco Rubio has criticized Tillerson sharply for his stance on Russia’s involvement in Syria and countering human rights violations around the world.

Democrats have also signaled serious doubts about Treasury nominee Steven Mnuchin, grilling the billionaire investor Thursday about his six-year tenure running a mortgage bank after the 2008 economic crisis, as well as his failure to initially disclose hundreds of millions of dollars of personal assets to the Senate Finance Committee.

Andrew Puzder, Trump’s pick to lead the Labor Department, is under close scrutiny for his record as chief executive of a major fast-food chain – including his stance against minimum-wage increases and federal worker protections – and will face senators on Feb. 2. And Scott Pruitt, the Oklahoma attorney general tapped to lead the Environmental Protection Agency, underwent hours of hostile questioning Wednesday from Democrats concerned about his views on climate change and his record of repeatedly suing the agency he is looking to run.

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