President Obama is still not qualified to occupy the Oval Office, a top Republican senator said on Tuesday.

Sen. Chuck Grassley (Iowa) believes that Obama is "not quite ready to be president," he said, citing Obama's dealing with foreign leaders on national-security issues.

“I imagine he’s darned intelligent, but I think he’s in over his head,” Grassley told the editorial board of the Quad City Times. “He’s just not quite ready to be president. But he is president, so you don’t worry about that.”

Obama's qualifications — or, according to Republicans, his lack thereof — were a major issue on the campaign trail in 2008. Grassley, the ranking member of the Finance Committee and a three-decade Senate veteran, revived the issue as Democrats face a tough political environment for the midterm elections. 

Obama, who has been in the White House for 21 months, served over three years in the U.S. Senate and over six years in the Illinois state Senate before being elected president.

Republicans have tied Democratic candidates around the country to Obama and Democratic leaders, arguing their policies have failed to spur a full-blown economic recovery.

Grassley, however, keyed in on what he said were Obama's foreign-policy missteps.

He praised the president’s ability to relate to people "one-on-one," according to the Times, but criticized Obama's decision to scrap a George W. Bush-era missile defense shield in Eastern Europe and prostrating himself before foreign heads of state.