Republican presidential candidate Donald Trump was particularly ecstatic to see a federal appeals court rule against President Obama's executive order allowing up to 5 million illegal immigrants to stay in the U.S. and work.

"I was so happy yesterday when I saw that decision come down," Trump said Tuesday during the fourth Republican debate in Milwaukee. "That was an unbelievable decision and we don't have enough of those decisions coming down."

"That was a great day and frankly, we have to stop illegal immigration," he added. "It's hurting us economically, it's hurting us from every standpoint. It's causing tremendous difficulty with respect to drugs and what that does to many inner cities in particular."

The billionaire candidate, whose incessant criticism of lax immigration laws has solidified his reputation as a hardliner on the issue, suggested Obama was able to get away with the executive order at first "because nobody wants to listen to him, including the Democrats."

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