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Lexie Schapitl

Updated at 4:29 p.m. ET

Republican members of Congress disrupted the closed-door proceedings of the House impeachment inquiry, preventing a Pentagon official from giving her testimony.

Arguing that the inquiry's interviews should not be held behind closed doors, GOP lawmakers entered the secure area in the Capitol Wednesday where witnesses are typically questioned.

Trade is a signature policy area for President Trump, and one where he has been able to take dramatic action. Trump's protectionist policies appealed to voters in the industrial Midwest, the region that was critical to his 2016 victory. Now, Democratic presidential candidates are campaigning in the shadow of Trump's tariffs, subsequent trade wars, and pursuit of a replacement for NAFTA.

Aside from having proposals for programs they would like to implement, Democratic presidential candidates have proposals for how they would like government to function.

The primary campaign has brought forth proposals to change all three branches of government, potentially impacting how laws are passed, the size and function of the Supreme Court, and how presidents are elected.

Below, we summarize how the 2020 Democratic contenders want to change U.S. governance in these three areas.