A subcontractor has a contract with the contractor for the services provided - an employee of the contractor cannot also be a subcontractor. Subcontractors undertake work that a contractor cannot do but for which the contractor is responsible.
Theodore Roosevelt became President in 1901 when President William  McKinley was assassinated that year. Roosevelt became the 26th  President of the United States.
Teddy Roosevelt served almost two terms as president. He became president after William McKinley was assassinated on Sept. 14, 1901, six months into his term as president.