Sen. Lindsey Graham warned Democrats against pushing for witnesses in President Trump's impeachment trial by predicting that Republicans have the necessary votes to call Hunter Biden, Joe Biden, and the whistleblower to testify.

"I'll make a prediction: There will be 51 Republican votes to call Hunter Biden, Joe Biden, the whistleblower, and the DNC staffer at a very minimum,” the South Carolina Republican told reporters.

Lindsey Graham makes a shocking prediction on calling Hunter Biden to testify:



"I'll make a prediction: There will be 51 Republican votes to call Hunter Biden, Joe Biden, the whistleblower and the DNC staffer at a minimum."pic.twitter.com/rM9vSFm5j6 — BlazeTV (@BlazeTV) January 28, 2020

Democrats have been demanding the ability to call witnesses in the trial and have specifically been focused on former national security adviser John Bolton after a leaked draft of his book appeared to contradict statements made by the president and his team regarding Trump's phone call with the president of Ukraine.

President Trump strongly denied Bolton's alleged account of events in a series of tweets on Monday.

“I NEVER told John Bolton that the aid to Ukraine was tied to investigations into Democrats, including the Bidens,” the president tweeted. “In fact, he never complained about this at the time of his very public termination. If John Bolton said this, it was only to sell a book.”

Graham and other Republicans have maintained that calling on Bolton would motivate them to call on other figures involved in the Ukrainian aid controversy, including Joe Biden and his son Hunter.

“We’ve got to be fair. We’ve got to follow the principle of reciprocity, which means if [Democrats] get John Bolton, we get Hunter Biden,” Sen. Ted Cruz, a Republican from Texas, told Fox News earlier this week.

“You have to be willfully blind and say that Democratic misconduct doesn’t matter to you not to believe that the president had a good reason to ask the Ukraine to look into the Biden affair,” Graham said about investigating the Bidens.

“As much as I like Joe Biden, he needs to answer questions of why he allowed his son to continue to receive millions of dollars from Burisma when he should’ve known it was a conflict of interest.”