Hari Sreenivasan:

President Trump has made it clear he remains strongly opposed to the Affordable Care Act, or what's been referred to as Obamacare.

And the president says he hopes to make another run at eventually repealing it. But, for now, it remains the law. And today is the opening of sign-up season for the insurance marketplaces.

Lisa Desjardins helps guide us through ways it is different this year.