President Donald Trump on Tuesday said he is asking for changes to the coronavirus relief bill passed by Congress, leaving the future of the $900 billion stimulus in doubt. Trump's position could threaten to torpedo the carefully drafted bill, which his own administration helped negotiate -- a move that could lead to a government shutdown and send the economy into a tailspin if he carried through with a veto. "I'm asking Congress to amend this bill and increase the ridiculously low $600 to $2000 or $4000 per couple," Trump said in a video released on Twitter. "I'm also asking Congress to immediately get rid of the wasteful and unnecessary items in this legislation or to send me a suitable bill."