Senate Democrats were far from thrilled to hear Sen. Bernie Sanders (I-Vt.) say Wednesday he would keep fighting for the presidential nomination, with some colleagues starting to drop hints he should consider ending his White House bid sooner rather than later.

Sanders was trounced Tuesday in Michigan, a state he won in 2016 and one that his supporters considered crucial to mounting a comeback against former Vice President Joe Biden. It now appears Sanders will need a political miracle to overcome his rival in the delegate race.

Senate Democrats, many of whom are not fans of the self-described democratic socialist’s signature proposals, such as “Medicare for All” and tuition-free college, are now suggesting Sanders should be thinking about wrapping up his campaign and help unify the party in its opposition to President Trump.

But they are treading very carefully, fearing a repeat of 2016, when many Sanders supporters skipped the general election because they felt the party tipped the scales unfairly against their candidate.