LONDON — Former U.S. presidential candidate Hillary Clinton cautioned Britain on Sunday over its push to secure a trade deal with U.S. President Donald Trump after it leaves the European Union. Clinton, the Democratic Party candidate who lost out to Trump in last November's election, also said Britain would face serious disruption if it left the EU without a negotiated deal with Brussels. The British government has talked up the prospect of bilateral trade deals with the United States and others as one of the major benefits of leaving the EU following last year's surprise referendum vote to leave. Asked...