CNBC host Jim Cramer has cautioned investors about the speculative nature of American Bitcoin (ABTC), a stock co-founded by Eric Trump. During a call on September 25, Cramer labeled ABTC as a 'total spec,' warning that investors could potentially lose everything. The stock, which began trading on Wall Street on September 3 following a merger with Gryphon Digital Mining, has fallen from $8.32 to $6.58 by September 26. Cramer also highlighted IREN Limited (IREN), which has seen a 380% stock rally, but he described it as 'too hot.'