Pope Francis on a visit to Mexico, the world’s second-largest Catholic country where he will spend about a week, Republican Presidential frontrunner Donald Trump lashed out at him for being “a very political person.” A large number of people gathered as the pontiff celebrated a mass in the Mexico City over the weekend, urging a better approach towards immigration.

“I think that the Pope is a very political person. I think that he doesn’t understand the problems our country has,” Trump said in an interview on Fox Business. “I don’t think he understands the danger of the open border that we have with Mexico.”

According to Bishop Mark Seitz of El Paso, Texas, the Pope’s call to treat a group of people, who have suffered greatly while trying to cross the border, might cause a few seek different solutions to the problem than this.

Trump fulminated at the Pope’s decision to visit Mexico amid campaigns that promise to build a giant wall at the border between the United States and Mexico to keep immigrants from entering the country.

Francis has already protested against the unsurpassable international borders, referring to them as “monuments of exclusion.” The pontiff also called on the US and Mexico to protect Central American migrants, especially children, who are trying to escape poverty.

The CNN reported that a little over a half of the Catholics in the United States (54 percent) think that Trump would make a good president, a poll conducted by Pew Research Centre found. However, according to a survey by the Public Religion Research Institute, a 50 percent of the Catholics in the US are in favour of Francis’ view on the immigration.

“I think Mexico got him to do it because Mexico wants to keep the border just the way it is because they’re making a fortune and we’re losing,” Trump said. While Francis has flagrantly advocated the cause of immigrants throughout his papacy.

However, Trump had showed support for the pontiff only as recently as June 2015, before he vouched to ignore Francis’ calls for action towards climate change.

“I love his stance, he is so different,” the Salon quoted Trump as telling the Bloomberg News.