Scottish Conservative leader Douglas Ross announces resignation.

Cites pressure over multiple roles and expenses claims as reasons.

Plans to step down on July 4 and resign as an MSP if he wins Westminster seat.

Decision follows controversy over replacing former UK Government minister David Duguid.

Initially planned to focus on Holyrood but will now prioritize Westminster role if elected.

SNP demands investigation into Ross's expenses claims related to refereeing work.

Political opponents criticize Tory government and Ross's leadership.

Resignation occurs amidst party tensions and allegations of questionable expenses.