FILE PHOTO: Democratic 2020 U.S. presidential candidates Senator Elizabeth Warren

FILE PHOTO: Democratic 2020 U.S. presidential candidates Senator Elizabeth Warren (D-MA) and Senator Bernie Sanders (I-VT) are seen on television monitors in the press room at the seventh Democratic 2020 presidential debate at Drake University in Des Moines, Iowa, U.S., January 14, 2020. REUTERS/Brenna Norman/File Photo