Former President Obama reportedly called his 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, on Saturday following Biden's decisive victory in the South Carolina Democratic primary.

Bloomberg reported Sunday evening that the 44th president and Biden shared a congratulatory call Saturday evening after Biden's overwhelming victory, where he won nearly 50 percent of the vote over his closest competitor, 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 won almost 20 percent of the vote.

Two sources close to the former president told Bloomberg that Obama will likely not add his endorsement to the list of establishment figures backing Biden, preferring instead to remain neutral during the primary.

Biden has sought to tie his campaign closely to his service in the Obama administration, and has attacked rivals including Sanders for his past criticism of the former president.

His victory Saturday in the South Carolina primary came after damaging losses in Iowa, New Hampshire and Nevada, where Biden finished behind other 2020 contenders, including Sanders.