Vice President Pence cancelled a scheduled interview with PBS shortly before it was set to occur Wednesday afternoon, according to an executive producer at the station.

"Moments ago, @VP Pence cancelled a scheduled interview with @newshour," tweeted Sara Just, a longtime ABC producer who came to "News Hour" to serve as its executive producer in 2014.

Moments ago @VP Pence cancelled a scheduled interview with @newshour — Sara Just (@sarajust) June 7, 2017

“We were running behind," Pence spokesman Marc Lotter explained to a pool reporter covering the vice president's visit to a NASA mission control center in Houston on Wednesday afternoon. Lotter said they had committed to reschedule.

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PBS correspondent Miles O’Brien was at Johnson Space Center in Houston to conduct the pre-arranged interview with Pence. PBS also promoted the interview on the air during Tuesday night's "NewsHour," hosted by Judy Woodruff.

Pence’s cancellation came shortly after former FBI Director James Comey released his opening statement one day before his highly anticipated testimony to Congress on Thursday.

In the statement set to be delivered to the Senate Intelligence Committee, Comey confirms reports that Trump asked him to "let go" of the investigation into former national security adviser Michael Flynn.

Comey also recounts multiple conversations with Trump in the statement, including one discussion in which the president asked him to "lift the cloud" of the FBI's investigation into Russia's interference in the election and alleged ties between Trump's campaign and Moscow.

In another conversation, which took place during a January dinner at the White House, Comey confirms that the president asked him for his loyalty.

At least 12 cable and broadcast networks, including PBS, will carry Comey's testimony networks, including CBS, NBC, ABC and FOX-TV.

Updated: 6:53 p.m.