Washington (CNN)New White House chief of staff John Kelly was so upset with how President Donald Trump handled the firing of FBI Director James Comey that Kelly called Comey afterward and said he was considering resigning, according to two sources familiar with a conversation between Kelly and Comey. Both sources cautioned that it was unclear how serious Kelly, then the secretary of homeland security, was about resigning himself. "John was angry and hurt by what he saw and the way (Comey) was treated," one of the sources said. Comey learned of his dismissal on May 9 from televisions tuned to...