Republican presidential candidate Donald Trump on Saturday called on Beie Sanders supporters to unite against presumptive presidential Democratic nominee Hillary Clinton.

Trump tweeted: “The Beie Sanders supporters are furious with the choice of Tim Kaine, who represents the opposite of what Beie stands for. Philly fight?”

Clinton on Friday aounced Virginia Sen. Tim Kaine as her ruing mate. Kaine, an experienced politician seen as a strong centrist, was widely thought to be Clinton’s safest pick.

But the Trump campaign wasted no time in slamming Kaine on social media.

“Tim Kaine is, and always has been, owned by the banks,” Trump tweeted. “Beie supporters are outraged, was their last choice. Beie fought for nothing!”

Trump also name-checked Sanders during his primetime speech on the last day of the Republican National Convention in Cleveland, reaching out to Sanders supporters join the Trump train.

2016 Election Headquarters

The latest headlines on the 2016 elections from the biggest name in politics. See Latest Coverage →

“I have seen firsthand how the system is rigged against our citizens, just like it was rigged against Beie Sanders. He ever had a chance,” Trump said. “But his supporters will join our movement, because we will fix his biggest issue.”

Despite the shout-out, Sanders tweeted a laundry list of reasons why his supporters should not back Trump.

He added, “Is this guy ruing for president or dictator?” Sanders tweeted.