Former Vice President Mike Pence speaks during a parents rights rally Wednesday, Feb. 15, 2023, in Cedar Rapids, Iowa. (AP Photo/Charlie Neibergall)

CEDAR RAPIDS, Iowa (AP) — Former Vice President Mike Pence says he’ll challenge a subpoena by the special counsel overseeing investigations into efforts by former President Donald Trump and his allies to overturn the results of the 2020 election. Pence says the subpoena to a vice president is unprecedented and unconstitutional. And he says he’s prepared to take the fight all the way to the Supreme Court. Pence is basing his challenge on constitutional grounds, namely the separation of power among the branches of government. The potential 2024 presidential candidate spoke Wednesday in Minneapolis as well as in Iowa, a key early-voting state on the presidential primary calendar.