Why were the federalists critical of the idea of a u.s. senate?

It did not include proportional representation.

Explanation:

Here are the answers to your questions:

For the first one, a legislator who introduces a bill is called the Sponsor of the bill.

For the second one, someone who carries out the roles of a chief diplomat, commander in chief, and chief executive in the United States is the president.

Hope my answers have come to your help.