With the presidential election less than 18 months away, President Donald Trump is using a page from his 2016 playbook to support his re-election campaign by spending more on Facebook ads than any of his 23 declared Democratic rivals.

In fact, from Dec. 30 to May 18, Trump’s campaign has pumped $4.9 million into purchasing advertising on Facebook, according to a report in the New York Times that cited data from Democratic political and brand communications company Bully Pulpit Interactive. The data showed that while the nearly two dozen Democrats in the presidential race have spent $9.6 million on Facebook ads over the past five months, no single candidate from that party comes close to the amount that Trump has invested in getting his message out over Facebook.

The nearest candidates to Trump in terms of Facebook ad spending this year are California Sen. Kamala Harris and Massachusetts Sen. Elizabeth Warren, both of whom have spent approximately $1.1 million on the platform. Former Vice President Joe Biden has already bet heavily on Facebook to get his message out, and has spent close to $1 million on the social media site since entering the race last month.

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Facebook to halt new political ads just before U.S. election Trump’s use of Facebook advertising is considered to be a major factor in winning the presidency in 2016, and the president isn’t shying away from sticking with what worked for him three years ago. Until late March, Trump had outspent all the Democrats who were in the race up to that time, and according to the Times, the president had $41 million in cash on hand for campaign spending at the end of the first quarter of the year.

The Times said the Bully Pulpit data showed the Trump campaign spending heavily on ads around immigration, and in expanding the president’s base by targeting ads at older Americans and women who are 55 and older.