“It could, I don’t know yet,” Graham said, when asked if the Bolton news changed his calculation. “The White House said there was no direct evidence of communications. Maybe this suggests that one person said there might be."

“Let’s see what’s in the manuscript, let’s see if it’s relevant, and if it is, I'll make a decision about Bolton,” Graham said.

He also would not say exactly how he would obtain the documents, or whether he would support a subpoena to obtain the documents. He did not say if he planned to make any of the documents public.

“It shouldn't be that hard,” Graham said. “Apparently the White House has it, you can ask for it.”

The South Carolina Republican’s comments are another sign of the rapidly shifting dynamics going into the second full week of the trial, a direct result of Sunday's report that Bolton has first-hand knowledge that Trump was personally attempting to hold up nearly $400 million in aid to Ukraine until that nation pursued investigations into former Vice President Joe Biden and his son, Hunter Biden.