President Donald Trump and Elon Musk speak in the Oval Office on March 14. (Demetrius Freeman/The Washington Post) By Liz Goodwin , Patrick Svitek , Jeff Stein and Marianna Sotomayor

The implosion of billionaire Elon Musk’s relationship with President Donald Trump has not just turned into a political headache for congressional Republicans — it has also frustrated their efforts to deliver on the president’s agenda. Subscribe for unlimited access to The Post You can cancel anytime. Subscribe

The fight between the Republican Party’s two most important figures, triggered by Musk’s open disdain for the price tag of Trump’s signature legislation, reopened a fault line in the GOP between the party’s fiscal hawks and those who have embraced Trump’s populist promises not to touch Med

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