The Fulton County special grand jury heard a phone call between former President Donald Trump and Georgia House Speaker David Ralston as part of its investigation into efforts to overturn the 2020 election results in Georgia, the jury’s foreperson, Emily Kohrs, told NBC News on Wednesday.

During the December call, Trump attempted to pressure the then-speaker into calling a special legislative session to overturn President Joe Biden’s victory in the battleground state, Kohrs said.

The call recording, which was first reported by The Atlanta Journal-Constitution, lasted about 10 minutes, Kohrs said. She recalled that Trump asked Ralston who would stop him from holding a special session. According to Kohrs, Ralston responded, “A federal judge, that’s who.”