I don't know how long this vetting process actually took but I have heard, among the many and varied reports, that eleven agencies were involved in it. What all they were I don't know.
Allowing an Arab firm to be become the owners of a company that employees his union members (a firm that will not be running any U.S. port).
Now, consider this. His port already has another similar facility managed by an Arab firm. They received that contract on his watch and he didn't oppose it then...and he fails to mention it now when he's making these accusations against the President.
It sure appears Schumer is far less concerned about who runs the business then he is in trying to undermine the President.