US Senator Tammy Duckworth, Democrat of Illinois, holds a pocket US Constitution as members of Congress hold a press conference regarding a lawsuit they have filed against US President Donald Trump for violating the emoluments clause of the US Constitution which bans Presidents from accepting payments benefits or gifts from foreign states without the consent of Congress, during a press conference on Capitol Hill in Washington, DC, June 20, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
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