This article originally appeared on MarketWatch.

Republicans are starting to fret that real estate magnate Donald Trump could win the nomination and then lose the election in a landslide. A new poll by YouGov for found that 49% of Americans are terrified by the prospect of a President Trump. Will Trump come under greater attack in Thursday’s debate?The RealClearPolitics average of polls, a crude but closely watched measure, reports that former Secretary of State Hillary Clinton would beat Trump by almost 3 percentage points if they become their parties’ nominees. She is forecast to lose to Sen. Ted Cruz by under a percentage point and to Sen. Marco Rubio by almost 5 percentage points.

Trump has not consistently shared the traditional Republican values of lower taxes and a smaller government. Although the media have attacked other Republican candidates on flip-flops and deviations from the party line, they have by and large left Trump alone. This would change if he were the nominee. Here are four potential areas for attack.

More at Source: Trump is Most Vulnerable on These Issues | Economics21