Some sciencists said that the east coast Indians came from Europe. But then, who knows how humans got here.
but there are pre-clovis sites in Monte Verde, Chile and Meadowcroft shelter, PA so there this is just another volley in the 30 year squabble.
The Solutrean Hypothesis claims similiarities between Clovis and Solutrean flintwork. They're so similar that even some experts hace difficulty discerning the difference between Solutrean and Clovis bifaces.
It's possible that Solutrean seal hunters found their way to North America along the edge of the winter pack ice, which extended from southern France to Newfoundland.