How to Counter Misinformation

To defend his policy of separating immigrant children from their parents, Trump uttered several bald-faced lies to deflect responsibility for the humanitarian crisis he created. Although the lies he and administration officials repeated seemed to represent a new nadir even for this presidency, the constant flow of misinformation from this White House has vexed political journalists from day one. How do you cover a president who frequently utters false claims without giving credence to the misinformation?