President Trump’s lawyer Rudy Giuliani insisted early Friday that congressional grilling of FBI agent Peter Strzok showed the investigation against his client is irreparably biased.

Giuliani called for special counsel Robert Mueller’s entire probe of the Trump campaign — and potential collusion with Russia — to be ended immediately, because Strzok once wrote text messages critical of the president.

“Peter Strzok’s testimony was a disgrace,” the former New York mayor tweeted at 12:44 a.m.

“It taints the entire Mueller witchunt. President Trump is being investigated by people who possess pathological hatred for him. All the results of the investigation are `fruit of the poison tree’ and should be dismissed.”

During a marathon session of the House Judiciary Committee on Thursday, Republicans accused Strzok of extreme bias.

The White House and Trump, who is away this week on a diplomatic tour in Europe, did not immediately comment on the Judiciary Committee fireworks.