Former CIA Director John Brennan testify before House intel panel

Former CIA Director John Brennan will appear before the House Intelligence Committee Tuesday to answer questions about allegations of Russia's interference in the presidential election, the AP reported.

The House and Senate intelligence committees are probing possible Russian interference in the 2016 election and whether Donald Trump's campaign staff may have colluded with Russian officials.

The House panel has also asked for more government documents connected with Trump's firing of FBI Director Jim Comey and any conversations they may have had about the FBI's own probe into Russia-Trump campaign alleged ties.

On Wednesday, the U.S. Justice Department appointed former FBI Director Robert Mueller III as special counsel to oversee the federal investigation into the Russia questions.

Rep. Devin Nunes, R-Calif., the chairman of the House Intelligence Committee, said he supports Mueller's appointment.

"This is the right decision at the right time, and the right man was chosen for the job," Nunes said in a statement. "Robert Mueller is a highly respected former FBI Director who has tremendous integrity, and I'm confident he will lead a credible investigation."

Rep. Adam Schiff, the ranking Democrat on the panel, also welcomed Mueller's appointment.

Trump denies any campaign links to Russians. On Twitter, he called the investigations a "witch hunt" Thursday.

Brennan served as CIA director under President Barack Obama.

Mueller served as FBI director under President George W. Bush for eight years and under Obama for another two.