Prosecutors are investigating whether cybersecurity contractors abused security clearances to feed the FBI false information linking Donald Trump to Russia. Cybersecurity experts who held lucrative Pentagon and homeland security contracts and high-level security clearances are under investigation for potentially abusing their government privileges to aid a 2016 Clinton campaign plot to falsely link Donald Trump to Russia and trigger an FBI investigation of him and his campaign, according to several sources familiar with the work of Special Counsel John Durham. Durham is investigating whether they were involved in a scheme to misuse sensitive, nonpublic internet data, which they had access...