It should have been a day of celebration - a picnic on the White House lawn with President Trump and his inner circle. But as the TV cameras filmed the mingling guests, a Republican Congressman and prominent Trump ally was pacing up and down on his phone. Congressman Chris Collins was a long-time investor and board member of a Sydney based company engaged in therapeutic drug development. On that fateful afternoon, he received confidential information that a crucial drug trial had failed and his investment was at risk. On Monday night Four Corners investigates the insider trading scandal that went on to engulf the Congressman and the major questions it raises for Australian regulators.