Rick Santorum on Thursday couldn’t name an achievement that Republican presidential hopeful Marco RubioMarco Antonio RubioOvernight Cybersecurity: Bipartisan bill aims to deter election interference | Russian hackers target Senate | House Intel panel subpoenas Bannon | DHS giving 'active defense' cyber tools to private sector Senators unveil bipartisan push to deter future election interference Puerto Rico's children need recovery funds MORE has accomplished during his Senate term.

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When pressed by the panel on MSNBC’s “Morning Joe,” Santorum, a former GOP candidate who is now backing Rubio's presidential bid, said there haven’t been many accomplishments in Congress during President Obama’s time in the White House.

“The bottom line is there isn't a lot of accomplishments, Joe, and I just don't think it's a fair question to say — over the last four years where nothing has happened and then blame one person because he didn't get accomplishments done,” the former Pennsylvania senator said. “Neither did President Obama.”

The 2012 Republican primary runner-up, who dropped out of the GOP primary race on Wednesday, referenced a $2.5 billion ObamaCare bailout that Rubio opposed.

“Well, I know he included something that went after the insurance companies in the most recent omnibus,” Santorum added. “He fought for that, to stop bailing out insurance companies. That's one thing I'm familiar that I just saw recently.”

He also said he’s backing Rubio  because “he’s someone who shares our values, my values, shares the values of working men and women.”