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MIAMI, FL - FEBRUARY 09: Sen. Marco Rubio (R-FL) speaks with the media after delivering remarks during the graduation of small business owners from the Goldman Sachs 10,000 Small Businesses program held at the Freedom Tower at Miami Dade College on February 9, 2015 in Miami, Florida. The Goldman Sachs 10,000 Small Businesses program helps owners in the Greater Miami area by providing them with greater access to business education, financial capital and business support services. (Photo by Joe Raedle/Getty Images) Joe Raedle, Getty Images

Marco Rubio has already apologized to the right wing base for his one-time support of comprehensive immigration reform, but two years later at the Conservative Political Action Conference (CPAC), Republicans are still bringing up the immigration "mistake" he made in the Senate.

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"You went forward with your immigration proposal, and at the end of the day you said, 'It didn't work. I tried...it's not going to work,'" Fox News' Sean Hannity said in a sit-down interview with the Florida senator at the conference.

Rubio insisted that his original plan was, in fact, "the single biggest lesson of the last two years."

"Well, it wasn't very popular. I don't know if you know that from some of the folks here," Rubio said in a joking aside.

The immigration plan that Hannity referenced was a 2013 immigration reform bill that Rubio played a key role in pushing. The legislation would have tightened border security, reworked the national visa program, and offered a path to citizenship for undocumented immigrants.

It's not exactly the sort of pitch that plays well at CPAC, the right wing's Super Bowl equivalent -- even two years later when the senator is considering a 2016 presidential run. And amidst the threat of a DHS shutdown because of President Obama's executive actions on immigration, it's a knock against Rubio's conservative bona fides.

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Marco Rubio answers for his failed 2013 immigration plans -- again