Arkansas Sen. Tom Cotton ripped the “van drivers and campaign flacks and failed novelists” who work national security at the White House Monday as kept up his opposition to the Iran deal.

During an interview with radio host Hugh Hewitt, Cotton blasted the White House after press secretary Josh Earnest openly mocked the Arkansas senator during Monday’s briefing, saying he was presenting “a wide range of information about the Iran deal that wasn’t true” — most notably that Iran will receive $150 billion in sanctions relief thanks to the deal. Many administration officials disagree with that assessment, arguing instead that the sanctions relief will amount to about $5 billion.