Joe Scarborough on Thursday said Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE’s aggressiveness exposes the billionaire’s lack of political experience.

“He’s been, the last two or three weeks, especially shrill and seeming to actually get off his game,” Scarborough said on MSNBC’s “Morning Joe" of the GOP presumptive presidential nominee. "I think the pressure only picks up between now and November. It gets tougher right now.

ADVERTISEMENT

“If he thinks the same thing that happens in the Republican primary is going to help him win in the general election, he just is a rank amateur and he doesn’t know what he’s talking about.”

Scarborough said Trump is rehashing the same tactics he used against Sen. Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE (R-Texas) to attack Democratic front-runner Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE.

“Here we are, in the general election for the most part, we might as well be, and he’s talking about her speaking ability, and he just says she ‘lies, lies, lies’ like he’s running against Ted Cruz,” he said.

“He’s regressing as a political candidate and it’s one of the more baffling things I’ve ever seen. He’s been a friend and people have been asking me for a couple weeks what’s going on with him. I haven’t a clue.”

Scarborough added that promises Trump would start acting more measured after the Republican primary have not panned out.

“For some time, we’ve heard reports in the press that the family has been trying to get Donald Trump to look more presidential,” he said.

“Paul Manafort has been trying to get Donald Trump to look more presidential,” Scarborough added of Trump’s convention manager. "They obviously are losing that battle.

“Things are going to start changing dramatically in this campaign. You’re going to see a lot of different lines of attack. We’ll see again how Donald Trump handles it. It’s going to be fascinating to see how he responds."