Mr. Nadler said some of the president’s actions detailed in the Mueller report, if proved, might warrant impeachment. But asked about beginning an impeachment inquiry, he said that “we may get to that, we may not,” adding that his committee’s task at hand was “to go through all the evidence, all the information and to go where the evidence leads us.”

His conditional response showed how House Democrats as a whole are continuing to grapple with how to answer the impeachment question — and present a united front.

Representative Elijah E. Cummings of Maryland, the chairman of the Committee on Oversight and Reform, conceded on “Face The Nation” that Democrats must be “very careful” in weighing whether to begin impeachment proceedings, but went further than Mr. Nadler in his analysis.

Even if the House voted to impeach Mr. Trump but the Senate failed to remove him, Mr. Cummings said, “I think history would smile upon us for standing up for the Constitution.”

With representatives back home in their districts on a recess, House Democrats will convene on Monday on a caucus conference call in the hopes of getting on the same page. Democrats, while doubling down on demands for an unredacted copy of the report and testimony from the Justice Department, have splintered into two camps on the issue of impeachment. Democratic leaders in the House, cognizant of the political perils of initiating an impeachment inquiry without bipartisan buy-in, have repeatedly thrown cold water on the idea. The party’s left flank, however, has urged leadership to begin proceedings, arguing that anything less would amount to an abdication of constitutional responsibility.

“What we are going to have to decide as a caucus is: What is the best thing for the country?” Representative Adam B. Schiff, the chairman of the House Intelligence Committee, said on ABC’s “This Week.” “Is the best thing for the country to take up an impeachment proceeding because to do otherwise sends a message that this conduct is somehow compatible with office? Or is it in the best interest of the country not to take up an impeachment that we know will not be successful in the Senate?”

Mr. Trump displayed no such hesitancy in his position. “How do you impeach a Republican President for a crime that was committed by the Democrats?” he tweeted on Sunday evening. “MAKE AMERICA GREAT AGAIN!”