washington presumptive republican presidential nominee donald trump meet u.s. senator joni ernst iowa monday feed speculation could short list consideration vice presidential run mate fox news report ernst tell network new york real estate mogul good conversation continue share insights donald need strengthen economy keep nation safe ensure america always strong stabilize force around globe say trump tweet would meet ernst new jersey do great job senator iowa say trump meet indiana governor mike pence also mention potential run mate wife saturday republican source tell reuters former house representatives speaker newt gingrich new jersey governor chris christie top trump vice presidential short list name watch include u.s. senators bob corker tennessee jeff sessions alabama governor mary fallin oklahoma source say trump meet senator ernst amid vice presidential speculation