Is the president of the United States unable to tell the truth — about anything?

This latest reported fib simply boggles my mind.

Donald J. Trump said he had received a phone call from Mexico’s President Enrique Pena Nieto congratulating him on the success of U.S. efforts to curb illegal immigration across the U.S.-Mexico border.

Trump made the remark Monday as he was introducing former Homeland Security Secretary John Kelly as the new White House chief of staff.

The president said “even the president of Mexico called me” to offer a pat on the back.

Hold on! The Mexican foreign ministry said no such call went through. It said President Pena Nieto did not call the U.S. president. He did not offer an encouraging word in the context that Trump described. The men haven’t spoken for some time, the ministry said.

Who do you believe? The president of a friendly nation who, as near as I can tell, is not prone to fabricate events or conversations? Or do you believe Donald John Trump Sr., the guy who has shown an amazing penchant for prevarication for, oh, his entire professional and political life?

It might be that Trump wished for a phone call. Maybe he dreamt it came.

Whatever. On this one, I’m going to go with the guy on the other side of our border.