The Pennsylvania Senate race is a toss-up and could easily determine control of the Senate, so Tuesday’s sole debate between Republican Mehmet Oz and Democrat John Fetterman is shaping up to be the most important debate of the year.

This month, the race has focused on Fetterman’s cognitive abilities following his stroke, but there are risks for Oz in how he talks about the issue on Tuesday. It’s certainly fair game for Oz to criticize Fetterman’s lack of candor. But he needs to discuss the issue without giving the appearance of mockery — something his campaign has failed to do in the past — and realize that voters will largely draw conclusions about Fetterman’s abilities based on what Fetterman (not Oz) says.

Evidence suggests Oz would be much wiser to focus on Fetterman’s extremism on the issues:

Fetterman has been hammered on the issue of crime, but he is also vulnerable on abortion. Fetterman has repeatedly said he opposes any legal limit on abortion at any point during pregnancy:

Democrats have tried to argue that elective late-term abortions simply never happen, but, as I’ve previously written, that’s not true:

The authors of a 2013 study on late abortions reported that “data suggest that most” abortions performed between weeks 20 and 28 of pregnancy are not performed for “reasons of fetal anomaly or life endangerment.” (“Little is known about the relatively few abortions occurring in the third trimester,” the same authors reported.)

Oz can easily disprove that false claim about late abortions by pointing to Philadelphia abortionist Kermit Gosnell. In addition to being convicted on three counts of murder for killing babies with scissors after they were born alive, Gosnell was convicted under Pennsylvania’s long-standing Abortion Control Act on 21 counts of killing babies in utero later than 24 weeks of pregnancy.

The 1982 Abortion Control Act includes an exception for physical threats to the mother’s life, so the late-term abortions for which Gosnell was convicted were purely elective. Fetterman openly says he opposes any legal limit on abortion, and he supports a bill that would invalidate Pennsylvania’s 24-week abortion limit because it lacks an exception for mental health: