″I'm not holding them indefinitely," Pelosi told reporters at the Capitol. "I'll send them over when I'm ready. That will probably be soon."

Pelosi said she's waiting for what she wanted from the start -- "to see the arena" and "terms of the engagement" that McConnell will use -- before sending her House managers to present the articles of impeachment in the Senate.
[...]
As Pelosi headed toward a morning meeting Thursday, Pelosi told reporters, "I know exactly when" she plans to send the impeachment articles over, but, "I won't be telling you right now.″

Asked if she had any concerns about losing support from Democrats for her strategy, she said: "No."
[...]
Returning to Washington from the campaign trail, Sen. Elizabeth Warren, D-Mass., told reporters she was confident in Pelosi's plan.

"I have no doubt that she will get this right," Warren said. "Some things are more important than politics, and the impeachment of a president is certainly one of those. No one is above the law, not even the president."