Donald Trump has attacked Ted Cruz's eligibility to be president after saying repeatedly that he saw no problem with it:

Donald Trump said in an interview that rival Ted Cruz's Canadian birthplace was a "very precarious" issue that could make the Texas senator vulnerable if he became the Republican presidential nominee.

"Republicans are going to have to ask themselves the question: 'Do we want a candidate who could be tied up in court for two years?' That'd be a big problem," Trump said when asked about the topic. "It'd be a very precarious one for Republicans because he'd be running and the courts may take a long time to make decision. You don't want to be running and have that kind of thing over your head."

This represent Donald Trump's second change of position on the subject.  Here's a quote from September of last year:

Republican presidential candidate Donald Trump has reversed his position on Ted Cruz's eligibility to run for president, now saying his Canadian birthplace shouldn't disqualify him.

"I hear it was checked out by every attorney and every which way and I understand Ted is in fine shape," Trump told ABC News just before speaking at a Capitol Hill rally blasting the Iran nuclear deal.

This is hardly the first time Trump has switched positions. He was pro-amnesty for illegal aliens; now he's against it.  He criticized Bill Clinton's sexual assaults but invited the alleged rapist to his wedding (because as a businessman, he liked to get along with everybody – even alleged rapists).  He was against funding Planned Parenthood on August 3 but supported subsidizing Planned Parenthood on August 11.

Ted Cruz has responded with a tweet showign the famous clip from Happy Days with Fonzie jumping the shark.

A great lover of polls, he has seen himself repeatedly falling to second place in Iowa, and now he has fallen to second place in California, behind Ted Cruz.

Is Trump panicking?

This article was written by Ed Straker, senior writer of NewsMachete.com, the conservative news site.