Second time in two weeks military used laser to attack what it mistakenly thought was a threat, disrupting air trafficSign up for the Breaking News US email to get newsletter alerts in your inboxDemocratic members of Congress have expressed astonishment and anger at what they claim is the incompetence of the Trump administration after the US military used a laser on Thursday to shoot down what it thought was a threatening drone on the US-Mexico border in Texas but later turned out to belong to U...