US Senate Leader Mitch McConnell left press conference mid-way, appearing disoriented.
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Concerns arise about his health after previous injury and halting speech.
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Colleagues guided him back to his office during the incident.
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McConnell assures he is "fine" but declines to comment on medical attention.
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Critics on Twitter raise questions about his health and age.
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Other senators with health issues bring attention to the matter.
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Public closely monitors his condition and its impact on his role as Senate leader.
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