Conservative attorney George Conway George Thomas ConwayGeorge Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' Susan Collins faces battle of lifetime in Maine Conway hails Trump as 'champion' of women MORE revealed Tuesday that he made the maximum allowable donation to former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE's presidential campaign as Biden surged to pick up multiple primary victories across the country on Super Tuesday.

In a tweet Tuesday evening, Conway included a screenshot of his donation to Biden's campaign as the former vice president was declared the winner in Virginia and Minnesota as well as a handful of other states.

Conway, husband to White House counselor Kellyanne Conway Kellyanne Elizabeth ConwayGeorge Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' Juan Williams: Swamp creature at the White House Oversight Democrats press for probe into possible Hatch Act violations MORE, is a vocal critic of President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE and has frequently called on the president to be removed from office.

Biden's campaign has made outreach to such Republicans a centerpiece of his campaign as he strikes a moderate tone in contrast to Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.), who entered Super Tuesday as the Democratic front-runner before a series of wins by the former vice president.