Who do you think it will be? 

Via Fox News: 

“I would expect a resignation this summer,” Sen. Chuck Grassley, the chairman of the Senate Judiciary Committee, told Iowa’s Muscatine Journal.

Grassley, R-Iowa, said there was a "rumored" retirement in the offing, though he wouldn't disclose which justice was considering stepping down.

Grassley’s comments echo those made in February by fellow Judiciary Committee member and former Supreme Court litigator Sen. Ted Cruz.

“I think we’ll have another Supreme Court vacancy this summer,” said Cruz, R-Texas. “If that happens, as much as the left is crazy now, they will go full Armageddon meltdown.”

Read more here.