Can the President Come and Force You so He Can Live In Your House?
Yes. This is true as long as there is a good and compelling reason for it. Eminent domain is a power reserved for the government to take private land for public use. This power is limited by the federal Constitution and by state constitutions -- when the government does take private property for public use, it must fairly compensate the owner for the deprivation. However, as the First Continental Congress stated: "Americans are entitled to life, liberty, and property, and they have never ceded to any sovereign power ... a right to dispose of either without their consent."
In other words, you are protected by the Takings Clause of the Constitution which says: "No person shall be deprived of ... property, without due process of law." If the government, even the president takes your property you should prove that a "taking" had occurred. The Takings Clause protects the private citizens from unreasonable government seizure of private property.
If you feel the government has taken your private property for public use, then you can seek fair compensation for such deprivation.
When the government does take private property for public use,
it must fairly compensate the owner.