After dropping in on Mexico's president, Donald Trump doubled down on his vow to make Mexico pay for a border wall.

With renewed bluster, Trump offered some clarity on his immigration policies Wednesday night in a speech in Arizona, renewing calls for a deportation force and pledging to build an "impenetrable" barrier on the U.S.-Mexico border.

"We will build a great wall along the southern border. And Mexico will pay for the wall, 100 percent. They don't know it yet, but they're going pay for the wall," Trump said.

Hours earlier, Trump met with Mexican President Enrique Pena Nieto in Mexico City and took a decidedly softer tone . In a tweet, Pena Nieto said after the meeting that he told Trump his country would not pay for the barrier.

The tweet translates to: "At the beginning of the conversation with Donald Trump I made it clear that Mexico will not pay for the wall."

In a subsequent tweet, the Mexican president said in Spanish, "From there, the conversation addressed other issues, and developed a respectful manner."

Trump's speech in Arizona, which lasted more than an hour, followed confusion over whether Trump had softened his immigration stance. He outlined the steps he would take to crack down on immigration, a priority he has loudly stressed from the outset of his campaign that was once perceived to be a long-shot.

Employing a nationalist message used throughout his campaign, Trump said the immigration debate should focus mainly on "the well-being of the American people." He contended that illegal immigration has sapped jobs and prosperity from low-skilled American workers, casting his Democratic opponent Hillary Clinton as a proponent of porous borders and easy entry.

Recent comments from Trump raised questions about whether he still wants to deport all of the estimated 11 million undocumented immigrants in the United States. In the speech, he did not commit to removing all of those immigrants, but said "anyone who has entered the U.S. illegally is subject to deportation."

Along with pledging to make Mexico fund a "beautiful" wall, Trump said he wanted to create a "special deportation task force focused on identifying and quickly removing" criminal undocumented immigrants. He said he would triple the number of Immigration and Customs Enforcement officers while focusing on the removal of criminals and people who have overstayed visas.

"You can call it 'deported' if you want, the press doesn't like that word. You can call if whatever the hell you want. They're gone," Trump said about his plan for a federal, state and local effort to remove criminal undocumented immigrants.