Ed Miliband says Baroness Warsi has "acted with principle and integrity" in resigning from the Foreign Office over the Gaza conflict.
He added on Twitter that David Cameron should "break his silence" over Israel's "indefensible actions".
I think Baroness Warsi has acted with principle & integrity. People around Britain have been shocked by the suffering we have seen in Gaza.
David Cameron is right to condemn Hamas as a terrorist organisation but he needs to break his silence on Israel's indefensible actions.
More top news
Former Liverpool striker Djibril Cisse has been arrested as part of an investigation into a blackmail case
Shadow Chancellor John McDonnell has come under huge pressure from party MPs after he made a major economic u-turn.