no person shall acquire a property interest in any potential or pending action under this subchapter; and

the President may suspend the right to bring an action under this subchapter with respect to confiscated property for a period of not more than 6 months if the President determines and reports in writing to the appropriate congressional committees at least 15 days before the suspension takes effect that such suspension is necessary to the national interests of the United States and will expedite a transition to democracy in Cuba.