The claim that Jack Smith testified Trump intimidated witnesses with death threats is mostly true because multiple reliable sources report Smith stating that Trump suggested a witness should be put to death and issued threatening statements implying retaliation against those who come after him, though direct evidence of actual death threats beyond these statements is not fully detailed.
Jack Smith testified that Trump intimidated witnesses with death threats.

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Source: nbcnews.com
Key Evidence
NBC News and Yahoo News report Smith testified Trump suggested a witness should be put to death and warned retaliation against those who come after him.
Raw Story clarifies Smith identified these intimidating statements during questioning.
No sources provide direct evidence of formal death threats beyond these reported intimidating remarks.
What the Evidence Shows
Jack Smith, the special counsel, testified before Congress in January 2026 regarding investigations into Donald Trump. Several sources (NBC News, Yahoo News, Raw Story) report that Smith said Trump made intimidating statements toward witnesses, including a suggestion that a witness should be put to death and a statement along the lines of 'If you come after me, I'm coming after you. ' These remarks were presented as evidence of intimidation.
However, the testimony does not appear to include direct proof of explicit death threats beyond these reported statements. Smith confirmed having evidence of these intimidating comments but did not specify additional concrete threats or actions beyond the verbal intimidation. The context indicates these statements were part of Trump's efforts to intimidate witnesses involved in investigations against him.
While the phrase 'death threats' is used in some media summaries, the primary evidence is Trump's suggestion about putting a witness to death and his retaliatory warnings, which constitute severe intimidation but may not meet the strict legal definition of formal death threats. Therefore, the claim is mostly true but should be understood with nuance regarding the nature of the threats described.