Gov. Roy Cooper (D-NC) said concerns over what Republican Lt. Gov. Mark Robinson would do when Cooper went out of state to campaign served as a reason why he took his name out of the running to be Vice President Kamala Harris‘s running mate.

Cooper, who is term-limited, was widely considered a top contender for the vice presidential slot on the Democratic Party’s ticket, hailing from the Republican-leaning battleground state of North Carolina. He announced earlier this week that he was taking his name out of consideration and offered insight into the decision on Politico’s Playbook Deep Dive podcast.