Advisers to President-elect Donald J. Trump’s transition team, facing complaints from Democrats that they are trying to jam nominees through confirmation hearings, said on Sunday they were confident all the appointees would be approved by the Senate, perhaps even with Democratic support. Being the minority party, the Democrats would face long odds in trying to derail any of the nominations. They are, however, seeking to delay Republicans’ plans to open hearings on Tuesday until the nominees have completed F.B.I. background checks.

Senator Mitch McConnell of Kentucky, the majority leader, signaled on Sunday that he was unwilling to reschedule any confirmation hearings, which are set to begin with sessions for John F. Kelly, Mr. Trump’s choice to be the secretary of Homeland Security, and for Senator Jeff Sessions of Alabama, the nominee to be attorney general. Five more hearings are scheduled for Wednesday. Mr. McConnell dismissed the Democrats’ complaints as sour grapes during an appearance on CBS’s “Face the Nation.” “All of these little procedural complaints are related to their frustration at having not only lost the White House, but having lost the Senate,” Mr. McConnell said. “I understand that. But we need to, sort of, grow up here and get past that,” he added. “We need to have the president’s national security team in place on Day 1. And papers are still coming in.”

The majority leader said that while the vetting process for some nominees might not be completed in time for their hearings, he was optimistic it would be finished before the Senate votes on each of the nominees. Several of Mr. Trump’s nominees are likely to face sharp questioning from Democrats about their records. But, when asked by reporters on Sunday whether he thought all of Mr. Trump’s appointees would be confirmed, Sean Spicer, who will be the White House press secretary, said, “Yes, we have an unbelievable all-star group of nominees.” Among those who will likely face tough scrutiny are Mr. Sessions and Rex W. Tillerson, the nominee to become secretary of state, whose hearing is scheduled for Wednesday. NY Times