Thousands of people protested in more than 150 Tax March rallies around the country Saturday to demand that President Donald Trump release his tax returns, and it all started with a tweet by Vermont Law School professor Jennifer Taub. Well, hers and a similar Tweet by comedian Frank Lesser.

On the heels of the record-setting Women’s Marchs in January, Taub and Lesser independently proposed that people take to the streets April 15 to push Trump to follow through on his campaign promise of making his returns public, a vow he has since backed away from.