Construction at the Obama Presidential Center in Chicago has been temporarily halted after a noose was discovered at the worksite Thursday morning. Lakeside Alliance, the construction company building the $830 million center, said it immediately notified police after the noose was reported on the premises, located in Jackson Park. The company told The Post in a statement that it suspended “all operations onsite” in order to provide its employees with an additional series of anti bias training, citing a “zero tolerance” policy “for any form of bias or hate on our worksite.”