Chart: How the Republican Fox Business Debate Topics Compare With the First Democratic Debate

What the Democrats versus the Republicans talked about during their respective debates. The Republican right-hand side is updated as of the end of main debate on Tuesday night. POLLY MOSENDZ/NEWSWEEK

On Tuesday evening, the Republican presidential candidates took to the stage for their fourth debate of the 2016 election season. At 7 p.m. EST, the four lowest polling candidates—Louisiana Governor Bobby Jindal, former Arkansas Governor Mike Huckabee, former Pennsylvania Senator Rick Santorum and New Jersey Governor Chris Christie—duked it out in Milkwaukee. At the 9 p.m. EST main-stage debate, the eight leading candidates took the stage.

During the 'undercard' debate, the candidates discussed everything from flat-rate tax plans to the Syrian refugee crisis. While some topics were repeats from GOP debates past, they still stood in contrast to the first Democratic debate, held earlier this month. In that exchange, the five Democratic candidates—Senator Jim Webb, Senator Bernie Sanders, former Secretary of State Hillary Clinton, former Maryland Governor Martin O'Malley and former Governor of Rhode Island Lincoln Chafee—discussed gun control, police brutality and environmental issues.

Here's how the comparison looks at the end of the main debate: