House Speaker Nancy Pelosi’s plan to withhold the articles of impeachment from the Senate to force terms for a trial is a “bizarre” and possibly unconstitutional move that won’t pay off, experts say.

Pelosi insisted on Thursday that before she will send the Republican-led Senate the articles of impeachment her Democrat-dominated chamber approved against President Trump, GOP leaders must provide more detail about how they will handle the trial, and she’s insisting on more witnesses, testimony and documents.

“Articles of impeachment were not meant to be articles of barter,” said impeachment expert Jonathan Turley, who testified before the House during the proceedings. “Just as the House elected not to seek to compel the testimony of critical witnesses, the Senate can make the same decision for its own house.”

Harvard Law professor emeritus Alan Dershowitz, slamming the impeachment itself as “unconstitutional,” said of Pelosi’s ploy, “It’s an unconstitutional gambit and it won’t work. … It would be like indicting someone and then just not having a trial and letting the charges sit there unresolved.”

If it doesn’t go to a Senate trial, he said, “The impeachment should be struck as void.”

Civil rights attorney lawyer Harvey Silverglate said there’s nothing in the Constitution that compels Pelosi to hand over the articles in a timely matter, or at all. But he described her stance as “kind of bizarre” and a “manipulation of the system.”

“This is sort of the Wild West,” Silverglate said. “I do not consider it a good development that impeachment in the modern era has been becoming more frequent. … The institution of the presidency has suffered a lot.”

Turley added, “The delay also contradicts the Democratic narrative that time is of the essence because this is a ‘crime spree in progress.'”

Wednesday night’s vote, almost entirely along party lines, made the president just the third in U.S. history to be impeached. The House impeached Trump on two charges — abusing his presidential power and obstructing Congress — stemming from his pressure on Ukraine to announce investigations of his political rival as Trump withheld U.S. aid.