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Less than 12 hours after Rex Tillerson was sworn in as Secretary of State, President Trump is picking some diplomatic fights with one long-time adversary and two traditional U.S. allies.

FOX's Jon Decker has more from the White House:

The President took to Twitter to say that Iran has formally been put on notice for firing a ballistic missile.

He also blasted a refugee resettlement deal with Australia in a late-night tweet, calling it a "dumb deal" and throwing the fate of more than 1,000 displaced people into doubt.

And according to the AP, President Donald Trump also reportedly warned in a phone call with his Mexican counterpart that he was ready to send U.S. troops to Mexico to stop what he called "bad hombres down there" unless the Mexican military does more to control them.

Mexico however, denies that President Trump made negative statements during his recent phone call with Mexican President Enrique Peña Nieto.

At the White House, Jon Decker, FOX News.