Joe Biden’s campaign says he’ll take up the Trump White House’s offer to consult about how best to combat the coronavirus outbreak.

The Wednesday afternoon statement is the latest in a back-and-forth that began in the morning with a taunt of the presumptive Democratic nominee by Kellyanne Conway, counselor to the president. Conway blasted Biden’s criticisms of President Trump as “petty,” including in a Tuesday night television interview. She challenged the former two-term vice president and 36-year Delaware senator to call President Trump to offer coronavirus pandemic strategies.