"Cotton appeared to be referring to Hawley, his potential rival for the Republican presidential nomination in 2024, whose campaign sent out a fundraising email Wednesday..."

"... promoting his plan to object to Pennsylvania’s electoral votes. The email was sent shortly before a pro-Trump mob stormed the U.S. Capitol, bringing a temporary halt to the counting of the Electoral College vote and leaving offices and hallways in the Capitol ransacked." 

The Hill says, commenting on this tweet from Tom Cotton (which says "while," not "shortly before"):

Some senators, for political gain, misled supporters about their ability to challenge the election results--some even sent out fundraising emails while insurrectionists stormed the Capitol.

That stops now--Republicans ought to focus on countering the Democrats' radical agenda. pic.twitter.com/e0JDg2bsJy

— Tom Cotton (@SenTomCotton) January 7, 2021