House investigators are examining whether President Trump lied to former special counsel Robert S. Mueller III, the House general counsel told a federal appeals court Monday in Washington.The hearing followed Friday’s conviction of longtime Trump friend Roger Stone for lying to Congress. Testimony and evidence at his trial appeared to cast doubt on Trump’s written answers to Mueller’s questions, specifically about whether the president was aware of his campaign’s attempts to learn about the release of hacked Democratic emails by the anti-secrecy group WikiLeaks.