Facebook co-founder Dustin Moskovitz has announced his endorsement of Hillary Clinton’s candidature for president in the November elections along with a donation of $20 million to help Clinton beat Republican nominee Donald Trump.

“This decision was not easy, particularly because we have reservations about anyone using large amounts of money to influence elections,” Moskovitz and his wife, Cari Tuna, wrote in a post on Medium, which outlined the beneficiaries of what is reportedly the third largest donation in this election cycle.

Moskovitz, who has never been active politically, used the post titled   “Compelled to Act” to justifiy the move by saying, “We hope these efforts make it a little more likely that Secretary Clinton is able to pursue the agenda she’s outlined, and serve as a signal to the Republican Party that by running this kind of campaign — one built on fear and hostility — and supporting this kind of candidate, they compel people to act in response.”

“If Donald Trump wins, the country will fall backward, and become more isolated from the global community,” he wrote.

dustin moskovitz Dustin Moskovitz, co-founder of Facebook, delivers his keynote address at the CTIA WIRELESS I.T. & Entertainment 2007 conference in San Francisco, Oct. 24, 2007. Photo: Getty Images/Kimberly White

The League of Conservation Voters Victory Fund and For Our Future PAC – both focusing on environmental and labor issues – will receive $5 million each. The other $10 million will go to the Democratic Congressional Campaign Committee, the Democratic Senatorial Campaign Committee , MoveOn.org Political Action, Color Of Change PAC, and “several nonpartisan voter registration and GOTV efforts.”

A notable omission from the list is Priorities USA, one of the most important political action committees supporting the democratic campaign.

“Cari and I have dedicated our lives to figuring out how to do the most good we can with the resources we've been given. Until now, those efforts have not included making endorsements or contributions in presidential elections,” Moskovitz wrote.

“The Republican Party, and Donald Trump in particular, is running on a zero-sum vision, stressing a false contest between their constituency and the rest of the world,” the 32-year-old added.

Tom Steyer, the Democratic California billionaire, has donated more than $30 million, while Bob Mercer, a big supporter of the Republican candidate, has given a little more than $20 million to the Republican campaign in the 2016 elections.