A former communications official in Donald Trump’s 2016 presidential campaign was warned multiple times by CNN’s Jim Acosta to stick to the truth during a contentious exchange on Wednesday morning. Appearing on CNN for a postmortem on the Tuesday night debate between the former president and Vice President Kamala Harris, Bryan Lanza attempted to clean up claims Trump made about abortion which in turn led the CNN host to admonish him that he was not going to be allowed to lie on-air. After Acosta noted Trump refused Tuesday night to say he would veto a national abortion ban bill if he was re-el…