Updated at 4:22 p.m. ET
Former President Donald Trump will not testify in the Senate impeachment trial, due to begin next week, Jason Miller, a senior adviser to Trump, tells NPR's Domenico Montanaro.
"The president will not testify in an unconstitutional proceeding," Miller said.
In a Thursday letter, Trump attorneys Bruce Castor and David Schoen called the request a "public relations stunt."