Meeting with all 3 makes sense.  I do have a problem with any foreign leader speaking to Congress. 

 Congress is supposed to represent American citizens, not foreign interests.  No foreigner should be allowed to stand up and tell (or beg) Congress what to do.  I don't care who the person is or which country they represent.  It is wrong.

A foreign leader can meet with government officials.  A foreign leader can even give a speech on American soil, but they should not do it from the floor of Congress.