Brother Joaquin issued same threat against Trump supporters in San Antonio last year
'I'm very proud of my brother'
'If you thought we had shy Trumpers in 2016, wait until 2020'
San Antonio man who contributed $10k to Castro now targeted by Texas congressman
Says list of private citizen Trump donors 'was already circulating'
Trump campaign blasts Castro's 'target list,' 'harassment of private citizens'
Brother Julian Castro 'proud' to also support bill (updated)