“The president, based on his past performance, he will do everything he can to make it not a fair election,” Nadler said on NBC’s “Meet the Press.”
“And that is part of what gives us the urgency to proceed with this impeachment,” he added.
House members and Senators will have to decide “in the face of an abundance of uncontested evidence” whether “the president poses a threat to our election,” Nadler said.
“Are they going to be patriots, or are they going to be partisans?” he asked.
“This is a matter of urgency to deal with because we have to make sure the next election is conducted with integrity and without foreign interference,” he added.
The House Judiciary Committee will hold an impeachment hearing Monday.
Nadler did not give a definitive time frame on when the House will vote on articles of impeachment.
Spokespeople for the White House and Trump campaign were not immediately available to respond to Nadler’s comments.