O'Rourke's official campaign website currently directs visitors to a fundraising page, but does not include a platform or policy proposal page.

O'Rourke, 46, reportedly raised more than $6.1 million in just 24 hours after announcing his candidacy on Thursday, the highest of any of the other candidates to officially declare thus far.

In his Senate race against Cruz in 2018, O'Rourke was able to raise more than $80 million, which far outpaced any other Senate candidate.

Cruz would go on to win by 2.6 points, but the close race immediately fueled speculation around a possible residential run for O'Rourke.