Monday on MSNBC’s “Morning Joe,” former Sen. Rick Santorum (R-PA), a candidate for the 2016 Republican nomination, weighed in on his party’s front-runner Donald Trump’s proposal to put a temporary halt on Muslims coming to the United States.

Santorum acknowledge there was a problem with Islam, and described it as a “cancer.”

“There are Muslims in this country who are actually going out and trying to establish a reform Islam, trying to deal with the problem, the cancer within Islam,” Santorum said. “And it’s real.”

The former Pennsylvania senator went on to add the problem with that cancer was most Muslims were not trying to solve this problem.

“There are lots of Muslims out there who are actually trying to confront the cancer,” he added. “And the bottom line is, most are not, and that’s a problem.”

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