If a bill makes it to the presidents desk he must sign it?

No, the president is not required to sign a bill that reaches their desk. The president has the option to either sign the bill into law, veto it, or take no action. If the president vetoes the bill, Congress can attempt to override the veto with a two-thirds majority in both chambers. If the president takes no action for ten days while Congress is in session, the bill automatically becomes law.