I believe Kerr is the liar. Never heard Pence or Trump say anything about Soleimani being involved in 9/11.
This appears to be the offending tweet of VP Pence that had the America-hating Kerr all worked up. It was part of a fairly large tweet thread where he lists many of the crimes that Soleimani has perpetrated over the years.
“Assisted in the clandestine travel to Afghanistan of 10 of the 12 terrorists who carried out the September 11 terrorist attacks in the United States.”
Kerr apparently believes that he ‘knows’ this to be false. He apparently believes his access to classified information is greater than VP Pence’s.