Sens. Rob Portman (R-Ohio) and Marco Rubio (R-Fla.) are showcasing their foreign-policy credentials at a critical juncture in Mitt Romney’s search for a running mate.

The two lawmakers used the Memorial Day recess to take high-profile trips abroad in what is seen as an effort to tout their knowledge on foreign-policy issues, an area that is not Romney’s forte.

Romney has primarily focused on President Obama’s handling of the ailing economy, but Republican officials say international policy matters will become more important as the campaign grinds on, especially with Syria, Egypt and Yemen attracting more U.S. news coverage in recent weeks.