In 1623 he was returned to the House of Commons for the borough of Lancaster, and sat with John Coke, William Noy and John Pym on Sergeant Glanville's election committee. He was also nominated reader of Lyon's Inn, an office he declined to undertake. For this the benchers of the Inner Temple fined him £20 and disqualified him from being one of their number. Nevertheless, after a few years, he became a master of the bench. In the first parliament of Charles I (1625), it appears from the "returns of members" printed in 1878 that contrary to the assertion of all his biographers, he had no seat. In Charles's second parliament (1626), he was elected for Great Bedwyn in Wiltshire, and took a prominent part in the impeachment of George Villiers, 1st Duke of Buckingham. In the following year, in Darnell's Case (the Five Knights' Case), he was counsel for Sir Edmund Hampden in the Court of King's Bench.