AP Photo/Manuel Balce Ceneta
- Trump on Saturday cheered the collapse of the Senate's border security bill.
- Trump railed against the legislation as an "open borders" bill backed by Biden.
- Biden said he'll hold Trump responsible for any border security issues from now through November.
Former President Donald Trump on Saturday took a victory lap for helping tank the Senate's bipartisan border security legislation, a bill that the ex-president repeatedly criticized as he has sought to make immigration a central tenet of his 2024 campaign.