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 on Thursday picked up a recent spat between the Democratic candidates and said he thinks 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 is not qualified for the presidency.

At a rally in Harrisburg, Pa., Trump said he would like Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE to continue his battle with Clinton over the Democratic presidential nomination.

“He’s been tough on her,” he said. "In fact, I’d like him to keep going. The longer he goes the more I’m going to like it.”

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Trump then rehashed a recent clash between the two Democrats over qualifications, first saying that he thinks Clinton is qualified for the job and then switching posiitons.

"[Sanders] said she suffers from bad judgement and she said — now I don’t know, I think she’s qualified, I guess. But that doesn’t mean she’s good," Trump said. "He said she’s not qualified to be president. Now what he meant is because her judgement is so bad — so Bernie Sanders, not me, said she’s not qualified. So now I’m going to say: She’s not qualified, OK?"

“We have all of the mistakes Hillary made as secretary of State," Trump continued. "We have a mess. The war in Iraq has been devastating. We have probably spent $4 trillion in the Middle East.”

But Trump said he would prefer facing Clinton in a general election because of her past political subterfuge.

“Now Bernie’s over, I guess,” the Republican presidential front-runner said. "It’s over for Bernie. I don’t want to run against Bernie. I want to run against crooked Hillary Clinton. We are going to beat her so badly. Is there anyone more crooked than this woman?”

Clinton defeated Sanders in New York’s Democratic presidential on Tuesday, dealing his Oval Office bid a major blow.

She leads Sanders by just over 1 point nationwide but boasts 741 delegates more than her rival for the Democratic presidential nomination.

Clinton’s delegate total includes 1,428 delegates and 502 superdelegates, versus Sanders’s 1,151 delegates and 38 superdelegates. At least 2,382 delegates are needed for avoiding a contested Democratic National Convention in Philadelphia in July.