President Donald Trump's decision to pull U.S. troops out of Syria , announced suddenly on Dec. 19, fulfills one of his 2016 campaign promises. As he looks toward the 2020 election, the president is clearly trying to make good on as many of those pledges as possible. Aside from the Syria move, Trump has started the process for leaving the Paris Agreement on climate change , departed the Trans-Pacific Partnership trade negotiations, withdrawn from the Iran nuclear deal and placed tariffs on a large number of Chinese goods . But many of his vows involving his signature foreign policy agenda and other geopolitically important items have yet to be fulfilled. Trump is likely to become more aggressive in trying to achieve some or all of them so he can campaign on additional achievements through 2019 and 2020.