Democrats’ embrace of sweeping progressive ideas like Medicare for All and the Green New Deal is about to get its first reality check on Capitol Hill — as both parties make huge bets about which message will sway voters in 2020.

For liberal Democrats, proposals to provide universal health care, combat climate change and create a fairer economy represent the kind of bold agenda they will need to unseat President Donald Trump, a candidate unafraid to make his own brash moves on trade and immigration. But Republicans are seizing on the same proposals to paint Democrats as socialist radicals, while trying to widen the ideological splits already emerging among Trump’s would-be challengers.