Can the cardinals do it? Can the bishops do it? . . . No, because a Pope leaves office only by freely resigning or dying (cf. Vatican II, Lumen Gentium, no. 22)
But, we can all . . . speak out in charity and pray. . . .
We must all appear before the Judgment Seat of Christ (2 Corinthians 5)
Use your conscience. Do the good that you see to do. Silence is often interpreted as assent. Right is right. Wrong is wrong.