President Obama, in his first public remarks on the prostitution scandal involving members of the Secret Service, said Sunday that he will be "angry" if the reported allegations against the agents turn out to be true. He said Secret Service personnel, like the rest of any U.S. delegation abroad, must "observe the highest standards." 

"We're here on behalf of our people and that means that we conduct ourselves with the utmost dignity and probity. And obviously what's been reported doesn't match up with those standards," Obama said, on the closing day of his visit to Colombia. 

The president, though, said he would wait until the internal investigation is complete before rendering a judgment. He said he expects the probe to be "thorough" and "rigorous" -- and that if the allegations turn out to be true, "then of course I'll be angry." 

The president addressed the controversy during a joint press conference with Colombian President Juan Manuel Santos.