Former Sen. Chuck Hagel (R-Neb.) is facing a multipronged assault on his record that casts doubt about his chances of becoming the next Defense secretary, even before he is formally nominated by President Obama.

Hagel has been criticized for prior statements on Israel lobbyists and a gay ambassadorial nominee, as well as his positions toward Iraq, Iran and Cuba.

Critiques of the Vietnam War veteran are coming from both his former colleagues in the Senate as well as advocacy groups, including one pro-Israel organization that produced an attack ad against him.

The push against Hagel is similar — though much less intense — to the criticism that U.S. Ambassador to the United Nations Susan Rice faced when she was considered for secretary of State. The uproar eventually led her to withdraw from consideration.