WASHINGTON — President Barack Obama on Monday will nominate Chuck Hagel as his next defense secretary and counterterrorism adviser John Brennan to lead the Central Intelligence Agency, two potentially controversial picks for his second-term national security team.

Hagel, even before being nominated, has faced tough criticism from congressional Republicans who say the former GOP senator is anti-Israel and soft on Iran. And Brennan, a 25-year CIA veteran, withdrew from consideration for the spy agency's top job in 2008 amid questions about his connection to harsh interrogation techniques used during the George W. Bush administration.

The White House said Obama will announce both nominations Monday afternoon. Along with secretary of state nominee Sen. John Kerry, D-Mass., Hagel and Brennan would play key roles implementing and shaping Obama's national security priorities in a second term. All three men must be confirmed by the Senate.