Jen Psaki actually said...
This is a risky move for Trump, because this is a role now that probably will not be taken at that level of seriousness by other U.N. ambassadors and it really diminishes the effectiveness of the first -- you know, role of the U.N. ambassador in New York.
Context
Jen Psaki warns that Trump's choice of Nauert for U.N. ambassador may undermine the role's effectiveness.
12/05/2018