Billionaire reality star Donald Trump on Monday warned Republicans that they should slow down efforts to reform the immigration system before "12 million illegals" become Democratic voters because the Hispanic immigrants could easily get into the country, while "the borders are secure from Europe."

During an interview on Fox & Friends, host Gretchen Carlson asked Trump for his reaction to the news that the Chamber of Commerce and the AFL-CIO had come to an agreement on allowing low-skilled migrant workers into the country.

"The Republicans are just absolutely rushing to do whatever they can to get out of the box they're in," the birther mogul explained. "And they're going to make it possible for 11 million or 12 million illegals to become citizens. And I always warn them and I tell them all the time -- they're calling and asking my opinion -- every single one of those 12 million people will be voting against the Republicans."

"You have to do the right thing, but those 12 million votes are going to the Democrats no matter what they do, no matter how far out in front they are. It makes absolutely no difference."

Co-host Steve Doocy pointed out that current immigration reform proposals would require the border to be certified as secured before undocumented immigrants could become citizens.

"Is the border secure right now?" Doocy wondered.

"Well, the border's not secure, we don't have secure borders anywhere," Trump opined. "The border is secure from Europe. I mean, the fact is if you want to come in from Europe and if you want to become a citizen and you're not here illegally and you go through the paperwork and the filing, you can't get in."

"And I'm saying, what are we doing in this country?" he continued. "If you come from certain parts of the world and you want to become a great, productive, wonderful citizen of this country, it's virtually impossible. Now, if you're an illegal and you're here, they're trying to find a pathway to citizenship."

"I can say this, the Republicans better be careful."

Speaking to the Conservative Political Action Conference (CPAC) last month, Trump had called on Republicans to fight for more white immigrants from Europe instead of going on a "suicide mission" to win Hispanic voters.

But according to Republican Texas Sen. John Cornyn, French-speaking people have been sneaking across the southern border illegally.

Cornyn last week told radio station KSEV that "we’ve got people coming across our place speaking Chinese, French and basically all of the languages in the world, coming through and across our southern border."

Watch this video from Fox News' Fox & Friends, broadcast April 1, 2013.