theodore roosevelt believed that the only checks on presidential power were\nthe house of representatives…

Answer:

the House of Representatives and the people.

Brief Explanations:

Theodore Roosevelt held the view that the House of Representatives (as part of the legislative branch) and the people (through democratic processes like elections) could act as checks on presidential power. The Senate is also part of the legislative branch, but Roosevelt emphasized the House more in this context. Corporation leaders are not traditional constitutional checks. The Constitution is a framework, but Roosevelt's stance here was more about the House and people. The Federal Reserve System is for monetary policy and the vice - president is a backup to the president, not a main check.