Mitt Romney’s last ditch effort last week to urge Republican voters not support the current frontrunner in the Republican presidential primary, Donald Trump, had little impact on the real estate mogul’s supporters, according to a Morning Consult poll released on Tuesday morning.

And what impact it did have seems to have been the opposite of what Romney intended.

Among Republican voters, 31 percent said they were more likely to vote for Trump following Romney’s speech, while 20 percent said they were less likely to vote for Trump. Among those voters who already supported the Republican presidential candidate, 56 percent said they were more likely to vote for him, while just 5 percent said they were less likely to vote for Trump.

In a Thursday speech at the University of Utah, Romney described Trump as dishonest and “a fake,” arguing that he does not have the right temperament to be president. In the unprecedented address, Romney told Republicans that if they elect Trump, “the prospects for a safe and prosperous future are greatly diminished.”

Morning Consult surveyed 2,029 registered voters online March 4-6 with a margin or error plus or minus 2 percentage points.