Should we also start an investigation into Hillary's possible collusion with Ukraine?

I saw these articles pop up on my Google news and had to ask this question

https://thehill.com/hilltv/rising/434892-senior-ukrainian-justice-official-says-hes-opened-probe-into-us-election

https://thehill.com/opinion/campaign/435029-as-russia-collusion-fades-ukrainian-plot-to-help-clinton-emerges

And then I saw this one and wondered if that was why Trump was so gung ho on having the Mueller report made public as well as why Mueller suddenly has all sorts of activity going on?

https://thehill.com/opinion/judiciary/430933-could-robert-mueller-actually-be-investigating-ukrainian-collusion