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Plus three other things you need to know today.

Chief Justice Roberts admonishes legal teams on first day of impeachment trial

During opening statements for the Senate impeachment trial of Donald Trump, a sharp exchange between the president’s defense team and the Democratic House managers prompted John Roberts to rebuke both sides and call for “civil discourse.” The GOP-run Senate voted down several amendments and approved trial rules without addressing the Democrats’ requests to subpoena documents or allow witnesses. 

Trump to unveil plan for middle-class tax cut 

Without many details, Donald Trump announced plans Tuesday to roll out within the next 90 days “a fairly substantial…middle-class tax” aimed at “keeping the Senate and keeping the White House.” This contradicts the timetable provided by National Economic Council Director Larry Kudlow, who told CNBC that the proposal could come later this summer. 

Supreme Court won’t expedite Obamacare appeal, leaving it in limbo

The top court rejected a bid by Democratic-controlled House of Representatives and 20 blue states to fast-track an appeal on the Affordable Care Act. Following the 5th US Circuit Court of Appeals ruling stating the healthcare law’s individual mandate was unconstitutional, Democrats pushed for the Supreme Court to issue a definitive ruling by June. With the court’s refusal, however, the fate of the ACA and the millions of Americans who depend on it for health care could remain in limbo beyond the presidential election in November.

Warren hires two top-ranking women of color from Castro’s campaign

In a further merging of support since Julian Castro ended his presidential bid and backed Sen. Elizabeth Warren, two senior staffers from the former candidate’s roster have joined Warren’s team: campaign manager Maya Rupert and Natalie Montelongo, Castro’s former political director. Rupert will be a senior adviser and Montelongo will be a senior strategist focusing on outreach, placing them among the highest-profile women of color in this election cycle.