WASHINGTON (AP) — Handed some 41,000 hours of Jan. 6 security footage, Fox News' Tucker Carlson has launched an impassioned new effort to explain away the deadly Capitol attack, linking the Republican Party ever more closely to pro-Trump conspiracy theories about the 2021 riot.

The conservative commentator aired a first installment to millions of viewers on his prime-time show, working to bend perceptions of the violent, grueling siege that played out for the world to see into a narrative favorable to Donald Trump.

He promised more Tuesday night — amid calls from critics to stop.

The undertaki...