The defense in Donald J. Trump's case sought to undermine the credibility of the prosecution's key witness, Michael D. Cohen, through their relationship with Robert J. Costello, a lawyer who had advised Cohen in the past.
Costello's role as a back channel between Cohen and Trump's legal team in 2018, facilitated by his close ties to Rudolph W. Giuliani, was highlighted. This connection raised questions about whether Costello was delivering instructions from Trump to Cohen.
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