Democrats promise that the public hearings, which begin Wednesday with William B. Taylor Jr., the top American diplomat in Ukraine, will methodically connect those actions to Mr. Trump and lay out the case that he abused the levers of his power for personal political advantage. In recent days, Adam B. Schiff, Democrat of California and the chairman of the House Intelligence Committee, said the public would “learn firsthand about the facts of the president’s misconduct.”
But after stumbling for weeks toward a coherent response, several people familiar with Republican deliberations said lawmakers were being hypervigilant about guarding against even the hint of a defection in their ranks. Any suggestion of support for impeachment could cause the dam to break, inflicting political damage on them and Mr. Trump, they fear.
The president’s defenders said they planned to do everything they could to sow doubt about the substance of the impeachment allegations, while trying to avoid the temptation to question the motivations and backgrounds of the witnesses called by Democrats — an approach they believe could backfire. They will leave that to Mr. Trump, who has regularly attacked witnesses on Twitter and in rants to reporters. On Friday, he denigrated the testimony as false and accused the witnesses of being “Never Trumpers” who “hate President Trump.”
Republicans acknowledge that they may not be able to stop Democrats from muscling through articles of impeachment on a party-line basis, but the party leaders believe they can stave off defections in the House and help ensure a speedy acquittal in the Republican-controlled Senate.
They will be helped by the fact that the burden is on the Democrats to make their case for removing Mr. Trump a year before a presidential election, said Ross H. Garber, one of the nation’s leading impeachment lawyers.
“The Democrats are trying to build a very high Jenga tower and Republicans just have to pull out a couple key pieces and the whole thing comes toppling down,” Mr. Garber said, referring to the popular game of carefully balanced wooden blocks.