MS Now reports: House Democrats are launching a new probe into Donald Trump Jr. and the venture capital firm he joined as a partner shortly after his father won a second term, alleging possible fraud and insider trading. In a letter shared first with MS NOW, Rep. Jamie Raskin, D-Md., the top Democrat on the House Judiciary Committee, asks the younger Trump to account for the recent run of success at 1789 Capital, whose investments over the past …