You’re Fired! Why Trump waited until now to fire his National Security adviser

As President Trump makes the first major reshuffle of his top team – firing Mike Waltz as his national security adviser – our US correspondents Mark Stone and James Matthews ask why it took so long for the repercussions of Signal-gate to bite.  
 
And, will the minerals deal between Ukraine and the US bring an end to the war a step closer? 
  
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