Donald Trump blasted Republican rivals Ben Carson and Sen. Marco Rubio on their immigration stances Tuesday morning during an appearance on Fox News' "Fox and Friends."

"Ben is very weak on immigration," Trump said. "Rubio is horrible on immigration."

In a handful of recent polls, Carson has threatened Trump's national lead for the first time in the Republican primary.

"Ben can't do the job. He's not going to be able to negotiate with China," Trump said. "It's not in his wheelhouse."

Read more on WashingtonExaminer.com