Sen. Marco Rubio met some resistance from conservatives while on “Fox News Sunday” when he was pressed on whether he was now advocating for Congress to tackle immigration reform in stages rather than through comprehensive reform.

The Florida Republic stood firm on his position, saying there are three things that need to be addressed by Congress: security, modernizing the legal system and addressing undocumented immigrants already in the country.

“Given everything that’s going on now, especially, the only way we’re going to make progress on this issue is to first deal with illegal immigration, secure the border, win people’s confidence that in reality this problem is under control,” Rubio said.

Elsewhere, White House advisor Dan Pfeiffer said President Barack Obama will make a decision on how to use his authority to address undocumented immigrants by the end of the summer.

Pfeiffer called reports that Obama might delay the deportation of up to 5 million immigrants "uninformed speculation” and that the President is waiting for recommendations from Attorney General Eric Holder and Homeland Secretary Jeh Johnson before taking action, but any actions would be within "the confines of the law."

He said on ABC News' "This Week" that Obama has no choice but to act on his own because of Congress' "failure to fix the immigration system" and to provide extra money to deal with Central American children crossing the U.S-Mexico border.

Rubio criticized a possible executive order from the President.

“We’re not debating what to do, we’re debating how to do it. And I’m just telling you, we will never the votes necessary to pass in one bill, all of those things. It just won’t happen,” Rubio said. “So, our choices are: We can continue to beat our heads against the wall and try a process for which we will never have the support, or we can try another way that we could perhaps make progress on."

The Associated Press contributed to this report.

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