President Donald Trump reiterated frustration at laws granting due process to illegal immigrants on Monday and said people should be turned away at the border, as expectations faded for a speedy fix in the U.S. Congress to the border crisis.

Heavily criticized for a policy that led to more than 2,000 children being separated from their parents at the U.S.-Mexico border, Trump defended his "zero tolerance" immigration policy, as government agencies struggle to address its ramifications.

"Hiring many thousands of judges, and going through a long and complicated legal process, is not the way to go — will always be disfunctional (sic)," Trump said in a tweet.