Just how much influence is President Donald Trump going to have on the U.S. Supreme Court? His administration hasn’t been quiet about its hopes to replace as many as four justices — with Justice Ruth Bader Ginsburg near the top of the list.

But with rumbling concerns about her health, Ginsburg doesn’t appear to be ready to step down. In fact, the same week she was a no-show at President Trump’s address to Congress, she was in the news for her impressive workout regimen.

Now aged 84, and the senior member of the high court’s four-person liberal wing, Ginsburg has had a series of health issues. Since the 1990s she has suffered two bouts of cancer as well as heart problems.

Here’s what you need to know:

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