The SNP deputy Westminster leader said Mr Yousaf, the current Scottish health secretary, was the only candidate that would take 'our party and our country forward'. He is due to appear on Sky's Sophy Ridge on Sunday show.
Paisley and Renfrewshire MP Ms Black endorsed Mr Yousaf after describing how she was"incredibly hurt" byMs Forbes, a Free Church of Scotland member, revealed how she would not have voted for the legislation on same-sex unions had she been at Holyrood at the time.
Ms Black, who married her wife last year, also said Mr Yousaf was the only candidate"willing to take the fight directly to Westminster" over its decision to veto controversial gender recognition reforms passed by Holyrood. Speaking on Sunday, Ms Black said:"Having listened to the early stages of the leadership campaign it is already clear to me that Humza is the only candidate that can take our party and our country forward.
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