Who are the four Republican rebels who forced Johnson's hand on Obamacare?

Four centrist House Republicans broke ranks to vote with Democrats on Wednesday, forcing a vote on extending Obamacare subsidies and risking the wrath of President Donald Trump and Republican leadership.

Republicans have struggled to address healthcare concerns, failing to put together a concrete plan to replace Obamacare. As Obamacare subsidies are set to expire, four centrist Republicans in vulnerable districts decided to defect to the Democratic side of the vote, giving House Minority Leader Hakeem Jeffries (D-NY) the necessary 218 signatures on his discharge petition to force House Speaker Mike Johnson (R-LA) to call a vote on the Democrats' bill to extend the subsidies by three years.