What did Donald Trump do today?

He tried to take credit for the Affordable Care Act, also known as Obamacare.

Today, Trump tweeted this:

Mini Mike Bloomberg is spending a lot of money on False Advertising. I was the person who saved preexisting Conditions in your Healthcare, you have it now, while at the same time winning the fight to rid you of the expensive, unfair and very unpopular Individual Mandate.........and, if Republicans win in court and take back the House of Representatives, your healthcare, that I have now brought to the best place in many years, will become the best ever, by far. I will always protect your Pre-Existing Conditions, the Dems will not!

Put another way, Trump is claiming that he "saved" the provision in the Affordable Care Act of 2010 that prevents health insurance companies for denying coverage to people with pre-existing conditions.

In reality, Trump supported (failed) bills that would have substantially weakened that provision. He also called for the straight repeal of the ACA in 2017, with no replacement, arguing that it would force Democrats to negotiate a new bill in order to protect people who would be hurt by the repeal.

The Trump administration is also supporting a lawsuit, now headed for the Supreme Court, which is attempting to get the entire ACA declared unconstitutional—including the pre-existing conditions portion. This is the "win in court" he referenced today, but he doesn't want to win too quickly: Trump pleaded with the court this week not to take it up until after the 2020 election.

In other words, Trump is literally saying that he holds exactly the opposite position than the one he does, and is accusing "Dems" of trying to do what he is actually doing.

Why should I care about this?

• Even by Trump's standards, this shows a lot of contempt for the people he thinks are dumb enough to believe him.