This president stated that the president can do anything that the needs of the nation demands unless such action was forbidden by the Constitution or by the laws.?

The president you are referring to is Theodore Roosevelt. He believed in a strong executive branch and famously articulated the idea that the president could take any action necessary for the nation, as long as it was not explicitly prohibited by the Constitution or laws. This philosophy is often associated with his interpretation of the "stewardship theory" of the presidency, emphasizing the role of the president as a proactive leader.