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https://npr.brightspotcdn.com/dims3/default/strip/false/crop/5105x2872 0 266/resize/1400/quality/100/format/jpeg/?url=http://npr-brightspot.s3.amazonaws.com/42/b8/2ea743e34194b2c0f15ebacaaa90/gettyimages-2160760781.jpgPresident Biden’s first formal solo news conference of the year is being closely watched to see how he handles curveballs. Many in his own party want him to step back from his reelection bid.