If the omnibus spending bill doesn't pass by 12:01 a.m. Saturday, the government will shut down.
McMaster is the second national security advisor to leave the Trump administration in just over one year.
Crown Prince Mohammed bin Salman enjoys common ground with Trump over opposition to the 2015 Iran nuclear deal.
After a tumultuous week in the West Wing, chief of staff John Kelly reassured staff Friday that there would be no resignations in the immediate future.
Press secretary Sarah Huckabee Sanders denied reports that national security advisor H.R. McMaster would be replaced.
The former porn star, whose legal name is Stephanie Clifford, claims "intimidation" against her by Trump and his lawyer.
White House Press Secretary Sarah Huckabee Sanders answers questions about Andrew McCabe and the Russia investigation.
White House Press Secretary Sarah Huckabee Sanders answers questions about the president's nominations for the State Department and the CIA, trade and the U.S. relationship with Russia's Vladimir Putin.
White House Press Secretary Sarah Huckabee Sanders answers questions about DACA, trade and the president's comments about the U.S.-Canada trade balance.
White House Press Secretary Sarah Huckabee Sanders answers questions about the latest White House departures.
White House Press Secretary Sarah Huckabee Sanders answers questions about news that Special Counsel Robert Mueller has subpoenaed documents from the Trump Organization, as well as the president's comments on the poisoning of a Russian operative in the U.K.
It's also the first time the White House press secretary will take the podium since the apparent Pennsylvania election upset.
The involvement of a Trump Organization lawyer may further connect the president to the non-disclosure agreement, even though he has tried to distance himself from the case, NBC News reported.
The briefing also follows the Trump administration's enactment of broad tariffs on steel and aluminum on Thursday.
If Trump must impose tariffs, Republicans called on him to focus on "China's unfair practices" instead.
It's the first press briefing since new questions were raised about the White House staff, the Mueller probe and Stormy Daniels.
Robert Mueller's subpoena had asked Sam Nunberg to hand over communications related to Trump and nine other people.
President Donald Trump isn't pleased with Alec Baldwin's latest comment that impersonating the president is "agony."
Questions will likely touch on trade policy, gun control stance, security clearance revisions and staff departures.
Trump has strongly advocated supplying "firearms adept" teachers with guns to deter potential shooters.