Healthcare is the leading issue going into Tuesday's midterm elections, according to polling.

One of the top healthcare-related campaign debates has come over protections for people with preexisting conditions.

President Donald Trump and Republican candidates have argued that the party supports protections for people with preexisting conditions.

Trump and the GOP's record flies in the face of that assertion.

Here are 4 ways that Trump and the Republicans have sought to make people with preexisting conditions worse.

According to multiple polls, healthcare is the top issue for voters in Tuesday's midterm elections and one healthcare fight has dominated the airwaves: preexisting conditions.

Democrats have gone all out attacking Republicans for their attempts to strip preexisting condition protections away from Americans, and the GOP has been on the defensive.

President Donald Trump has continually claimed that his administration and the entire Republican Party's healthcare platform would provide as good, if not better, protections for people with preexisting conditions.

"Republicans will protect people with pre-existing conditions far better than the Dems!" Trump tweeted Wednesday, the latest in a slew of earlier tweets on the subject.

Read more: Republicans tried to kill Obamacare. Now they're trying to embrace its most popular feature in a defining fight of the midterms»

It's no wonder that Trump is focused on the issue: Voters rank healthcare among the most important issues for the upcoming midterm elections. Protecting preexisting conditions is a large — and popular — part of that concern.

The protections created in the Affordable Care Act, or Obamacare, made it so that insurance companies could:

Not deny people coverage because of a preexisting condition, known as guaranteed issue.

Not charge more because of a preexisting condition or any other health status, an idea called community rating.

Read more: Democrats are embracing a radical change to US healthcare, and it could be the defining political fight for years to come

But while Trump may toss out the suggestion that the GOP will provide similar preexisting condition protections for Americans, the actions of the administration and the party it represents are very much in conflict with that promise.

Outside of the GOP's eight-year crusade to repeal Obamacare, which created the protections, the Trump administration has recently attempted to undermine preexisting condition protections in various ways.

Here's a rundown of four different actions taken by Trump or the GOP that would harm the protections: