A senior lawmaker in the U.S. House of Representatives on Sunday rejected the notion that Democrats must decide whether to pursue the impeachment of Republican President Donald Trump before the 2020 election season shifts into high gear.

With some Democrats warning that the window for impeachment was closing with the approach of elections, House Judiciary Committee Chairman Jerrold Nadler was asked if he thought there was a deadline.

"No, I don't," Nadler told CNN's "State of the Union." His committee is charged with initiating any impeachment proceedings.