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nbsp;CLICK HERE FOR COMPLETE CORONAVIRUS COVERAGEPresident Joe Biden is expected to formally announce the partnership between rivals Merck and Johnson & Johnson later Tuesday. merrell nova He faces a challenge in the Democratic primary from Carlos Vega, a former prosecutor who has raised about $132,000 since announcing his campaign in December, according to records. merrell nova nbsp;Trump's defense could technically start making their arguments Thursday if the House managers end their opening statements early, but they are more likely to begin on Friday. merrell nova In the interim, "Jeopardy!" producers announced Wednesday that Ken Jennings, Katie Couric, Aaron Rodgers, Bill Whitaker, and Mayim Bialik "will each take their turn as guest hosts. merrell nova