Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) late Sunday shared his New Year’s resolution: to “intensify the struggle against Trumpism.”

“In 2018, we will not only intensify the struggle against Trumpism, we will increase our efforts to spread the progressive vision in every corner of the land,” Sanders tweeted.

Here is a New Year's Resolution I hope you will share with me. In 2018, we will not only intensify the struggle against Trumpism, we will increase our efforts to spread the progressive vision in every corner of the land. — Bernie Sanders (@SenSanders) December 31, 2017

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Sanders has been a frequent and vocal critic of President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE, even calling on the president to consider resigning because of sexual misconduct allegations.

Sanders has also advocated for progressive policies, including universal health care, free tuition at public universities and colleges and campaign finance reform.

Sanders, who lost the 2016 Democratic presidential nomination to Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE, is considered among the leading candidates to run for the Democratic nomination in 2020.

The independent senator is spending New Year’s Day in New York City, where he will swear in Mayor Bill de Blasio (D) for a second term. Sanders previously appeared at a campaign rally for de Blasio.

A number of other lawmakers shared New Year's resolutions on Sunday, with several vowing to oppose Trump and Republicans.