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.) on Saturday said President Trump's attacks on the judiciary and media prove he "does not understand" what democracy or the Constitution are about.

"A president who attacks a judge who rules against him as a 'so-called judge' clearly does not understand what our Constitution is about. A president who attacks media that makes critical remarks about him as 'fake news' does not understand what democracy is about," Sanders said in a series of tweets.

A president who attacks a judge who rules against him as a “so-called judge” clearly does not understand what our Constitution is about. — Bernie Sanders (@SenSanders) February 11, 2017

A president who attacks media that makes critical remarks about him as “fake news” does not understand what democracy is about. — Bernie Sanders (@SenSanders) February 11, 2017

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Trump this week tweeted attacks on the federal judges that ruled against his travel ban, and has frequently targeted the New York Times and CNN.

Earlier Saturday, Trump again hit courts in defense of his travel ban.

“Our legal system is broken! "77% of refugees allowed into U.S. since travel reprieve hail from seven suspect countries." (WT) SO DANGEROUS!” he tweeted, quoting a Washington Times article published Thursday.