A bipartisan group of senators introduced legislation Thursday to extend the term of FBI Director Robert Mueller by two years.

Sens. Patrick Leahy (D-Vt.), Chuck Grassley (R-Iowa), Dianne Feinstein (D-Calif.) and Saxby Chambliss (R-Ga.) introduced the bill to approve a one-time extension of Mueller's tenure.

President Obama called on Congress to extend Mueller's term earlier this month.

"The ten-year term for an FBI director is good for the agency and our country. It was designed to insulate the FBI Director from the political process and ensure that no one Director amass too much power. It has worked for thirty-five years," Leahy said in a statement. 

"Given the complex and uncertain time we live in, the good work of Director Mueller following September 11, and a heightened alert to terrorist attack following the death of Osama Bin Laden, this one-time statutory exemption that will extend the term of FBI Director Mueller’s term by two years is the right decision," Leahy continued.

Earlier this month Grassley seemed more cautious about extending Mueller's term.

"I’m open to the President’s idea, but I will need to know more about his plan to ensure that this is not a more permanent extension that would undermine the purposes of the term limit,” Grassley had said in a statement.