Bill Clinton 'Dumbfounded' by Donald Trump's Visit to Mexico After a brief hiatus from campaigning, President Bill Clinton is back.

 -- After a brief hiatus from campaigning, former President Bill Clinton is back on the trail, picking up where he left off: attacking Donald Trump. The former president kicked off his multi-state day of campaigning by marching in the Detroit Labor Day parade and delivering brief remarks at a BBQ picnic.

Addressing union workers from the bed of a pickup truck, Clinton publicly addressed Trump’s recent trip to Mexico for the first time, saying he was “dumbfounded” by the trip and arguing that Trump's visit was damaging to the United States.

“I’ve had that job. That damaged America and every serious country in the world,” said the former president. “You cannot be the leader of a country, go down and be nice to people and then come home and dump on them for your own political benefit.”

Clinton’s remarks about Trump echo the Clinton campaign sentiment that there are many sides to the Republican presidential nominee. Clinton said that Trump appeared to have made strides with Mexican President Enrique Peña Nieto and then delivered a very different type of speech once he returned stateside, calling for the rounding up of undocumented immigrants.

“If you got a beef with somebody, you go to them, look them in the eye, and in a respectful way, you can say, ‘I disagree,’” said Clinton. “And then you come home and equally respectfully say, 'This is what I said.'”

Clinton said that instead of working on an agreement with President Peña Nieto, Trump was deceptive and threw “blood all over him.”

“I promise you, every country in the world was looking at him and said, ‘This is not the America I know. The America I know keeps its word. The America I know shoots straight. The America I know, even when I disagree,'” said Clinton.

Clinton also defended the recent scrutiny of his presidential foundation by attacking Trump’s foundation.

“It’s tempting to run this campaign on Mr. Trump’s greatest hits. You know there’s so much material and so little time,” said Clinton. “He criticized my foundation which has gotten top ratings from every one of these rating agencies.”

Trump has called the Bill, Hillary and Chelsea Clinton Foundation a “pay to play” operation and has repeatedly questioned the relationship between the foundation and the State Department when Hillary Clinton was secretary of state. But today, Clinton brought up recent reports of Trump’s foundation having to pay a large fine to the IRS for contributing to a group tied to a Florida politician.

Clinton will head to Ohio to round out his Labor Day Weekend and will then head to North Carolina and Florida to continue campaigning for Hillary Clinton.