Can the president appoint anyone as a supreme court justice?
What requirements are there for becoming a supreme court justice? Do you need to be a lawyer or not?
Technically speaking, a Supreme Court justice does not have any required qualifications whatsoever in the constitution. That said, I don't believe that anyone has ever been appointed to the Supreme Court who was not already a lawyer.
Most have previous experience as a judge, although Elena Kagan is a current example of an exception. Prior to Kagan, the last exception was William Rehnquist, appointed by Richard Nixon.
The typical Supreme Court justice was previously a federal appeals court judge and had a "Well Qualified" rating from the American Bar Association.
I would find it unlikely for Donald Trump to nominate someone to the Supreme Court who was not a lawyer. All the possibilities that he mentioned are lawyers and most are judges. The Senate might not confirm such a nominee. But it is not prohibited.