The Democratic-led U.S. House of Representatives will send formal impeachment charges against President Donald Trump to the Senate as early as next week, House Speaker Nancy Pelosi said on Friday, Reuters reported.

Pelosi, the top Democrat in the House, has been engaged in a three-week cat-and-mouse game with Senate Majority Leader Mitch McConnell over the rules for Trump’s trial in the Republican-controlled Senate.

In a letter to House Democratic lawmakers on Friday, Pelosi said a resolution could be brought up next week to appoint House “managers” to prosecute the case against Trump at the trial and to transmit the impeachment charges to the Senate.

Democrats have demanded it include new witness testimony and evidence about the Republican president’s pressuring of Ukraine to probe former Vice President Joe Biden, a leading Democrat running for the right to face Trump in the November election.

McConnell slammed the door on that idea this week, saying he had enough Republican votes to start the trial without a commitment to hear from additional witnesses, including former Trump national security adviser John Bolton.

The Senate is expected to acquit Trump before the 2020 presidential election campaign heats up, as no Republicans have voiced support for ousting him, a step that would require a two-thirds majority.