Democratic presidential candidate Hillary Clinton’s struggle to win over Sen. Bernie Sanders’ fans was highlighted Wednesday when the liberal magazine Nation gave Clinton its endorsement while repeatedly stressing that it was doing so only because of its opposition to Republican candidate Donald Trump.

“We know that some readers will find it hard to vote for Clinton; we ask them to think again,” the magazine said in an unsigned editorial posted online. The editorial warned readers that Clinton was liable to turn on them as soon as she was in office.