"It was bad enough that Mark Jacobs called Joni Ernst 'AWOL' while she was on duty serving in the Iowa National Guard, but the fact that he has refused to remove this offensive term from his website is inexcusable," McCain said in a statement on Tuesday, according to the Register.
In April, the Cedar Rapids Gazette reviewed Ernst's missed votes and reported that most of them did not directly coincide with her National Guard commitments.
Ernst has also made national headlines recently for her campaign ads. One featured her shooting a gun and vowing to "unload" on Obamacare. Another focused on her experience castrating pigs which, Ernst argued, is how she would handle pork barrel spending if sent to Washington.